Calculate when .

MATHEMATICS · Single correct · CBSE · Mathematics · Trigonometric Functions · Trigonometric Functions

Problem

Calculate

\cos 2\theta

when

\theta=30^{\circ}

. (a)

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

(b)

1

(c)

\dfrac{1}{2}

(d)

-\dfrac{1}{2}

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