(cosA + sinA)^2 + ( cosA- sinA) ^2 = 2 Prove
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Answer:
(CosA+SinA)²+(CosA-SinA)²=2.
Taking The LHS:
=Cos²A+Sin²A+2CosASinA+Cos²A+Sin²A-2CosASinA
=1+2CosASinA+1-2CosASinA
=2.
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