====== Trigonometric Functions ======

Note all trigonometric data are radians (not degrees)

==== COSINE ====

**cos(a)** - cosine
==== SINE ====

**sin(a)** - sine
==== TANGENT ====

**tan(a)** - tangent
==== COTANGENT ====

**ctan(a)** - cotangent
==== ARCTANGENT ====

**atan(a)** - arctangent
==== ARCSINE ====

**asin(a)** - arcsine
==== ARCCOS ====

**acos(a)** - arccosine
==== ARCTAN2 ====

**atan2(y,x)** - arctangent => y and x must be one dimensional signals; return one dimensional signal