If x=a cos theeta + a sin theeta; y=a sin theeta - b cos theeta, prove that x2 + y2 - Maths - Trigonometry

Question

If x=a cos theeta + a sin theeta; y=a sin theeta - b cos theeta,
prove that x2 + y2 = a2 +
b2

Abhishek Kr. Jha · Accepted Answer

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If x=a cos theeta + a sin theeta; y=a sin theeta - b cos theeta, prove that x2 + y2 = a2 + b2