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If sin A + cos A = m and sin^3 A + cos^3...

If sin A + cos A = m and `sin^3 A + cos^3A=n`, then (1) `m^3-3m + n = 0` (2) `n^3-3n + 2m=0` (3) `m^3-3m + 2n = 0` (4) `m3 + 3m + 2n = 0 `

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