If and , determine…

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

Problem

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

and

0^{\circ}<\theta<90^{\circ}

, determine

\cos 2\theta

. (a)

\dfrac{24}{25}

(b)

\dfrac{7}{25}

(c)

\dfrac{16}{25}

(d)

-\dfrac{7}{25}