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Which statement regarding the function y=cos(x) is true?

A. cos(x) = cos(-x)
B. Since the cosine function is even, reflection over the x-axis does not change the graph.
C. cos(x) = -cos(x)
D. The cosine function is odd, so it is symmetrical across the origin.

Respuesta :

mathmate
A. cos(x) = cos(-x)  [correct, since cos(x) is an even function]
B. Since the cosine function is even, reflection over the x-axis [y-axis] does not change the graph.  [false]
C. cos(x) = -cos(x)   [ false]
D. The cosine function is odd [even], so it is symmetrical across the origin.   [false]
alessiacooper49
cos(x)=cos(-x)-For apex people who are trying to make sure.

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