If and is an acute angle

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

Problem

If sin⁡θ=35\sin\theta=\dfrac{3}{5} and θ\theta is an acute angle, find sin⁡3θ\sin 3\theta. (a) −117125-\dfrac{117}{125} (b) 925\dfrac{9}{25} (c) 117125\dfrac{117}{125} (d) 2425\dfrac{24}{25}

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