CBSE

MATHEMATICS · Single correct · CBSE · Mathematics · Continuity and Differentiability · Continuity and Differentiability

Problem

d20ydx20(2cos⁡xcos⁡3x)\frac{d^{20}y}{dx^{20}}(2 \cos x \cos 3x) is equal to (a) 220(cos⁡2x−220cos⁡3x)2^{20}(\cos 2x - 2^{20} \cos 3x) (b) 220(cos⁡2x+220cos⁡4x)2^{20}(\cos 2x + 2^{20} \cos 4x) (c) 220(sin⁡2x+220sin⁡4x)2^{20}(\sin 2x + 2^{20} \sin 4x) (d) 220(sin⁡2x−220sin⁡4x)2^{20}(\sin 2x - 2^{20} \sin 4x)

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