Which of the following is the correct identity for ?

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

Problem

Which of the following is the correct identity for cos⁡3θ\cos 3\theta? (a) 4cos⁡3θ+3cos⁡θ4\cos^{3}\theta+3\cos\theta (b) 3cos⁡θ−4cos⁡3θ3\cos\theta-4\cos^{3}\theta (c) 4cos⁡3θ−3cos⁡θ4\cos^{3}\theta-3\cos\theta (d) 4cos⁡θ−3cos⁡3θ4\cos\theta-3\cos^{3}\theta

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