Note all trigonometric data are radians (not degrees)
cos(a) - cosine
sin(a) - sine
tan(a) - tangent
ctan(a) - cotangent
atan(a) - arctangent
asin(a) - arcsine
acos(a) - arccosine
atan2(y,x) - arctangent ⇒ y and x must be one dimensional signals; return one dimensional signal