How do you evaluate arccos (0)?

1 Answer
Jul 27, 2015

arccos0 means: find the angle that has a cosine of 0

Explanation:

The cos-function crosses the 0 every 180 ^o orpi rad, beginning at 90 ^o or pi/2 rad

So arccos(0)=90^o +-k*180^o

Or arccos(0)=pi/2+-k*pi rad

Usually, you are asked to evaluate a function between certain limits, like 0^o <=x<=360^o or 0<-x<=2pi
From the above you can find the values that fit.