Mathematics

Mathematics

Problem

A trigonometric function

y=f(x)

attains its maximum value

1

at

x=0

, has its next zero at

x=\dfrac{\pi}{2}

, and its graph is symmetric about the

y

-axis. Which of the following could be

f(x)

? a)

-\cos x

b)

\cos 2x

c)

\cos x

d)

\sin x

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