If x = a cosÎ¸+ b sinÎ¸ and y = b cosÎ¸- a sinÎ¸, then x2 + y2 – McqOptions

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1.	If x = a cosÎ¸+ b sinÎ¸ and y = b cosÎ¸- a sinÎ¸, then x2 + y2 is equal to
A.	ab
B.	a2+b2
C.	a2-b2
D.	1
Answer» C. a2-b2

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