Given and , what is the sign of…

MATHEMATICS · Single correct · A Level · Mathematics · Trigonometry · Trigonometry

Problem

Given

\sin x=\dfrac{3}{5}

and

\dfrac{\pi}{2}<x<\pi

, what is the sign of

\cos 3x

? (a) Negative (b) Cannot be determined (c) Positive (d) Zero

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