I) VILIf a = x cose + y sino, b = x sino - y cose then x + y = – InterviewSolution

1.

I) VILIf a = x cose + y sino, b = x sino - y cose then x + y =

Answer»

a×b=x²cos²A-y²sin²Aa×b=x²cos²A-y²(1-cos²A)ab-y²=cos²A(x²+y²)(ab-y²)/cos²A=(x²+y²)

a²+b² is the correct answer of the given question

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