If and lies in the second quadrant

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

Problem

If

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

and

\theta

lies in the second quadrant, determine

\cos 2\theta

. (a)

-\dfrac{7}{25}

(b)

\dfrac{24}{25}

(c)

\dfrac{7}{25}

(d)

\dfrac{16}{25}

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