Asked by John
if g(x) = cos2x
find g(-x)
find g(-x)
Answers
Answered by
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)
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