diff --git a/Cargo.toml b/Cargo.toml
index 1113088..5c36965 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "quickmath"
-version = "0.3.0"
+version = "0.3.1"
 edition = "2021"
 authors = [ "Valerie Wolfe <sleeplessval@gmail.com>" ]
 description = "A quick command-line math evaluator."
diff --git a/src/context/helper.rs b/src/context/helper.rs
index 221147a..6f4ad2b 100644
--- a/src/context/helper.rs
+++ b/src/context/helper.rs
@@ -10,71 +10,95 @@ pub type EvalResult = Result<Value, EvalexprError>;
 
 
 //	Mathematics
+pub fn cosine(arg: &Value) -> EvalResult {
+	Ok(
+		if		let Value::Float(float)	= arg { float.clone() }
+		else if	let Value::Int(int)		= arg { int.clone() as f64 }
+		else { return Err(EvalexprError::expected_number(arg.clone())) }
+		.cos().into()
+	)
+}
+
 pub fn fix(arg: &Value) -> EvalResult {
-	let args = arg.as_tuple()?;
+	if let Value::Tuple(args) = arg {
+		let len = args.len();
+		if len == 2 {
+			let value =
+				if let Value::Float(float) = args[0] { float.clone() }
+				else { return Err(EvalexprError::expected_float(args[0].clone())); };
 
-	let count = args.len();
-	if count != 2 {
-		return Err(EvalexprError::WrongFunctionArgumentAmount { expected: 2..=2, actual: count });
-	}
+			let operand = 10u64.pow(
+				if let Value::Int(int) = args[1] { int.clone() }
+				else { return Err(EvalexprError::expected_int(args[1].clone())); }
+				as u32
+			) as f64;
 
-	let float = args[0].as_float()?;
-	let figures = args[1].as_int()?;
-
-	let operand: f64 = i64::pow(10, figures as u32) as f64;
-	let output = f64::round(float * operand) / operand;
-	return Ok(output.into());
+			Ok( ((value * operand).round() / operand).into() )
+		} else { Err(EvalexprError::wrong_function_argument_amount(len, 2)) }
+	} else { Err(EvalexprError::wrong_function_argument_amount(1, 2)) }
 }
 
 pub fn logarithm(arg: &Value) -> EvalResult {
-	let arguments: Vec<Value>;
-	let count: usize;
-	if arg.is_tuple() {
-		arguments = arg.as_tuple()?;
-		count = arguments.len();
-	} else if arg.is_float() {
-		arguments = vec!(arg.as_float()?.into());
-		count = 1;
-	} else if arg.is_int() {
-		arguments = vec!((arg.as_int()? as f64).into());
-		count = 1;
-	} else {
-		return Err(EvalexprError::CustomMessage("Expected numbers".to_string()));
+	let value: f64;
+	let base: Option<f64>;
+	match arg {
+		Value::Tuple(tuple)
+			=>	{
+				let len = tuple.len();
+				if len != 2 { return Err(EvalexprError::WrongOperatorArgumentAmount { expected: 2, actual: len }) }
+
+				let i_value = tuple.get(0).unwrap();
+				if		let Value::Float(float)	= i_value { value = float.clone(); }
+				else if	let Value::Int(int)		= i_value { value = int.clone() as f64; }
+				else { return Err(EvalexprError::expected_number(i_value.clone())); }
+
+				let i_base = tuple.get(1).unwrap();
+				if		let Value::Float(float)	= i_value { base = Some(float.clone()); }
+				else if	let Value::Int(int)		= i_value { base = Some(int.clone() as f64); }
+				else { return Err(EvalexprError::expected_number(i_base.clone())); }
+			},
+		Value::Float(float)
+			=>	{
+				value = float.clone();
+				base = None;
+			},
+		Value::Int(int)
+			=>	{
+				value = int.clone() as f64;
+				base = None;
+			}
+		_	=>	return Err(EvalexprError::CustomMessage("Expected numbers.".to_owned()))
 	}
 
-	let output: Value;
-	match count {
-		1 => {
-			let argument = &arguments[0];
-			if !argument.is_number() {
-				return Err(EvalexprError::CustomMessage("Expected number".to_string()));
-			}
-			let number = if argument.is_float() { argument.as_float()? } else { argument.as_int()? as f64 };
-			output = number.ln().into();
-		},
-		2 => {
-			let arg_value = &arguments[0];
-			let arg_base = &arguments[1];
-			if !(arg_value.is_number() && arg_base.is_number()) {
-				return Err(EvalexprError::CustomMessage("Expected two numbers".to_string()));
-			}
-			let value: f64 = if arg_value.is_float() { arg_value.as_float()? } else { arg_value.as_int()? as f64 };
-			let base: f64 = if arg_base.is_float() { arg_base.as_float()? } else { arg_base.as_int()? as f64 };
-			output = value.log(base).into();
-		},
-		_ => {
-			return Err(EvalexprError::WrongFunctionArgumentAmount { expected: 2..=2, actual: count });
-		}
-	}
-	return Ok(output);
+	if let Some(base) = base { Ok(value.log(base).into()) }
+	else { Ok(value.ln().into()) }
+}
+
+pub fn sine(arg: &Value) -> EvalResult {
+	Ok(
+		if		let Value::Float(float)	= arg { float.clone() }
+		else if	let Value::Int(int)		= arg { int.clone() as f64 }
+		else { return Err(EvalexprError::expected_number(arg.clone())) }
+		.sin().into()
+	)
 }
 
 pub fn square_root(arg: &Value) -> EvalResult {
-	if !arg.is_number() {
-		return Err(EvalexprError::CustomMessage("Expected a number.".to_string()));
-	}
-	let value: f64 = if arg.is_float() { arg.as_float()? } else { arg.as_int()? as f64 };
-	return Ok(value.sqrt().into());
+	Ok(
+		if		let Value::Float(float)	= arg { float.clone() }
+		else if	let Value::Int(int)		= arg { int.clone() as f64 }
+		else { return Err(EvalexprError::expected_number(arg.clone())) }
+		.sqrt().into()
+	)
+}
+
+pub fn tangent(arg: &Value) -> EvalResult {
+	Ok(
+		if		let Value::Float(float)	= arg { float.clone() }
+		else if	let Value::Int(int)		= arg { int.clone() as f64 }
+		else { return Err(EvalexprError::expected_number(arg.clone())) }
+		.tan().into()
+	)
 }
 
 
diff --git a/src/context/mod.rs b/src/context/mod.rs
index ee794e1..3023be6 100644
--- a/src/context/mod.rs
+++ b/src/context/mod.rs
@@ -2,3 +2,67 @@
 pub mod global;
 pub mod helper;
 
+
+use pico_args::Arguments;
+use evalexpr::{
+	context_map,
+
+	ContextWithMutableVariables,
+	HashMapContext,
+	Value
+};
+
+use crate::flag;
+
+pub fn build(args: &mut Arguments) -> HashMapContext {
+	let mut output =
+		if !args.contains(flag::EMPTY_CONTEXT) {
+			context_map! {
+				//	globals
+				"c"		=>	global::LIGHT_SPEED,
+				"e"		=>	global::EULER,
+				"phi"	=>	global::GOLDEN_RATIO,
+				"pi"	=>	global::PI,
+				"√2"	=>	global::ROOT_TWO,
+
+				//	math functions
+				"cos"	=>	Function::new(|arg| helper::cosine(arg)),
+				"fix"	=>	Function::new(|arg| helper::fix(arg)),
+				"log"	=>	Function::new(|arg| helper::logarithm(arg)),
+				"sin"	=>	Function::new(|arg| helper::sine(arg)),
+				"sqrt"	=>	Function::new(|arg| helper::square_root(arg)),
+				"tan"	=>	Function::new(|arg| helper::tangent(arg)),
+
+				//	data science functions
+				"avg"	=>	Function::new(|arg| helper::average(arg)),
+
+				//	radix functions
+				"bin"	=>	Function::new(|arg| helper::binary(arg)),
+				"hex"	=>	Function::new(|arg| helper::hexadecimal(arg)),
+				"oct"	=>	Function::new(|arg| helper::octal(arg)),
+
+				//	character aliases
+				"ϕ"		=>	global::GOLDEN_RATIO,
+				"π"		=>	global::PI,
+				"√"		=>	Function::new(|arg| helper::square_root(arg))
+			}.unwrap()
+		} else { HashMapContext::new() };
+
+	while let Ok(value) = args.value_from_str::<&str, String>(flag::SET) {
+		let split: Vec<&str> = value.split('=').collect();
+		if split.len() == 2 {
+			let key = split[0].to_owned();
+
+			let value_str = split[1];
+			let value =
+				if let Ok(integer) = value_str.parse::<i64>() { Value::Int(integer) }
+				else if let Ok(float) = value_str.parse::<f64>() { Value::Float(float) }
+				else { Value::from(value_str) };
+
+			output.set_value(key, value).ok(); }
+		else { std::process::exit(1); }
+	}
+
+	output
+}
+
diff --git a/src/main.rs b/src/main.rs
index 4e94690..241157f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -42,7 +42,7 @@ fn main() {
 		return;
 	}
 
-	let mut context = util::build_context(&mut args);
+	let mut context = context::build(&mut args);
 	let quiet = args.contains(flag::QUIET) || !stdout().is_terminal();
 
 	//	collect args and evaluate if present
diff --git a/src/util.rs b/src/util.rs
index 0eda23c..be4b2ec 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -1,13 +1,5 @@
 
-use evalexpr::{
-	context_map, ContextWithMutableVariables, EvalexprError, HashMapContext, Value
-};
-use pico_args::Arguments;
-
-use crate::{
-	context::{ global, helper },
-	flag
-};
+use evalexpr::{ EvalexprError, Value };
 
 pub(crate) fn parse_radix(prefix: &str, base: u32, arg: &Value) -> Result<Value, EvalexprError> {
 	let i_parse = arg.as_string()?;
@@ -22,52 +14,3 @@ pub(crate) fn parse_radix(prefix: &str, base: u32, arg: &Value) -> Result<Value,
 	return Ok(result.unwrap().into());
 }
 
-pub(crate) fn build_context(args: &mut Arguments) -> HashMapContext {
-	let mut output =
-		if !args.contains(flag::EMPTY_CONTEXT) {
-			context_map! {
-				//	globals
-				"c"		=>	global::LIGHT_SPEED,
-				"e"		=>	global::EULER,
-				"phi"	=>	global::GOLDEN_RATIO,
-				"pi"	=>	global::PI,
-				"√2"	=>	global::ROOT_TWO,
-
-				//	math functions
-				"fix"	=>	Function::new(|arg| helper::fix(arg)),
-				"log"	=>	Function::new(|arg| helper::logarithm(arg)),
-				"sqrt"	=>	Function::new(|arg| helper::square_root(arg)),
-
-				//	data science functions
-				"avg"	=>	Function::new(|arg| helper::average(arg)),
-
-				//	radix functions
-				"bin"	=>	Function::new(|arg| helper::binary(arg)),
-				"hex"	=>	Function::new(|arg| helper::hexadecimal(arg)),
-				"oct"	=>	Function::new(|arg| helper::octal(arg)),
-
-				//	character aliases
-				"ϕ"		=>	global::GOLDEN_RATIO,
-				"π"		=>	global::PI,
-				"√"		=>	Function::new(|arg| helper::square_root(arg))
-			}.unwrap()
-		} else { HashMapContext::new() };
-
-	while let Ok(value) = args.value_from_str::<&str, String>(flag::SET) {
-		let split: Vec<&str> = value.split('=').collect();
-		if split.len() == 2 {
-			let key = split[0].to_owned();
-
-			let value_str = split[1];
-			let value =
-				if let Ok(integer) = value_str.parse::<i64>() { Value::Int(integer) }
-				else if let Ok(float) = value_str.parse::<f64>() { Value::Float(float) }
-				else { Value::from(value_str) };
-
-			output.set_value(key, value).ok(); }
-		else { std::process::exit(1); }
-	}
-
-	output
-}
-