Question

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.

Answer 1

cos(x)=cos(-x)-For apex people who are trying to make sure.

Answer 2

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]