If where is acute

MATHEMATICS · Single correct · AP · AP Precalculus · Trigonometric and Polar Functions · Trigonometric and Polar Functions

Problem

If cos⁡θ=35\cos \theta = \dfrac{3}{5} where θ\theta is acute, calculate sin⁡3θ\sin 3\theta. (a) 117125\dfrac{117}{125} (b) −117125-\dfrac{117}{125} (c) 44125\dfrac{44}{125} (d) 72125\dfrac{72}{125}

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