Prove that (SinA+CosA)(1-SinA into CosA) = Sin³A+Cos³A
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Answer:
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Step-by-step explanation:
L.H.S. = (sinA + cosA)(1 - sinA X cosA)
= sinA - sin²A X cosA + cosA - sinA X cos²A
= sinA - sinA X cos²A + cosA - sin²A X cosA
= sinA(1 - cos²A) + cosA(1 - sin²A)
= sinA X sin²A + cosA X cos²A
= sin³A + cos³A
= R.H.S. Proved Ans.
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