(Sina+cosa)(1-sinacosa)=sin3a+cos3a
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L.H.S. = (sinA + cosA)(1 - sinA*cosA)
= sinA - sin^2A * cosA + cosA - sinA * cos^2A
= sinA - sinA * cos^2A + cosA - sin^2A * cosA
= sinA(1 - cos^2A) + cosA(1 - sin^2A)
= sinA * sin^2A + cosA * cos^2A
= sin^3A + cos^3A
= R.H.S. Proved Ans
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