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ICSE Class X Math 2017 Paper

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Question : 26 of 31
Marks: +1, -0
Prove that
  sin⁡θ−2sin⁡3θ2cos⁡3θ−cos⁡θ=tan⁡θ\; \frac{\sin\theta - 2\sin^3\theta}{2\cos^3\theta - \cos\theta} = \tan\theta
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