How do you solve #cos^2theta=1#?
1 Answer
Nov 25, 2016
First take the square root of both sides.
#sqrt(cos^2theta) = sqrt1#
Simplify, and don't forget the
#costheta = +-1#
Now think back to the unit circle and find the values where
#theta = 0, pi#
Those are the answers in the range from
#theta = 2pin, pi + 2pin#