If x = a cosθ + b sinθ and y = a sinθ - b cosθ, then what is (x2 + – McqOptions

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1.	If x = a cosθ + b sinθ and y = a sinθ - b cosθ, then what is (x2 + y2) equal to?
A.	2ab
B.	a + b
C.	a2 + b2
D.	a2 - b2
Answer» D. a2 - b2

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