Posted by **Rei** on Wednesday, May 16, 2012 at 4:02pm.

Given: f(x)=2 cos x and g(x)=sin x. Which of these expressions is equivalent to (fxg)(π/16)?

a) cos π/8

b) sin π/8

c) cos π/4

d) sin π/4

Please explain the answer, thank you.

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