If , then the value of must…

MATHEMATICS · Subjective · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

If sin⁡θ+sin⁡2θ+sin⁡3θ=1\sin \theta + \sin^2 \theta + \sin^3 \theta = 1 , then the value of cos⁡6θ−4cos⁡4θ+8cos⁡2θ\cos^6 \theta - 4 \cos^4 \theta + 8 \cos^2 \theta must be

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