If and , prove that…

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

If sin⁡A+cos⁡A=m\sin A + \cos A = m and sin⁡3A+cos⁡3A=n\sin^3 A + \cos^3 A = n , prove that m3−3m+2n=0m^3 - 3m + 2n = 0 .

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