If x = a cosθ + b sinθ and y = a sinθ – b cosθ, the value of x2 – McqOptions

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1.	If x = a cosθ + b sinθ and y = a sinθ – b cosθ, the value of x2 + y2 is:
A.	a2 – b2
B.	a – b
C.	a2 + b2
D.	a + b
Answer» D. a + b

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