Question
if g(x) = cos2x
find g(-x)
find g(-x)
Answers
Reiny
because of the symmetry about the y-axis of the cosine function,
cos(x) = cos(-x)
so g(-x) = cos (2(-x)) = cos (2x)
cos(x) = cos(-x)
so g(-x) = cos (2(-x)) = cos (2x)