ACOS, ASIN, ATAN

arccosine - The inverse function of cosine.
arcsine - The inverse function of sine.
arctangent - The inverse function of tangent.

Syntax:

ACOS(number)
ASIN(number)
ATAN(number)

number represents the cosine of an angle.

Example:



Now let's use calc to evaluate the arccosine of 3/5, arcsine of 4/5, and arctangent of 4/3.

=ACOS(3/5) will return .92729522
=ASIN(4/5) will return .92729522
=ATAN(4/3) will return .92729522

Note: The ACOS, ASIN, ATAN functions return the angle in radian measure. We will talk about getting an answer is degrees later with the DEGREE function.

Screen Shot of ACOS():