Suppose is an acute angle and

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

Problem

Suppose

\theta

is an acute angle and

\cos 2\theta = \dfrac13

. What is the value of

\sin\theta

? (a)

\sqrt{\dfrac{2}{3}}

(b)

\dfrac{2}{3}

(c)

\sqrt{\dfrac{1}{3}}

(d)

\dfrac{1}{3}

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