Evaluate the expression cos^4 x - sin^4 x , given that cos^2 x - sin – McqOptions

MCQOPTIONS

1.	Evaluate the expression cos^4 x - sin^4 x , given that cos^2 x - sin^2 x = 9 / 11
A.	(9 / 13)
B.	(3 / 123)
C.	(9 / 11)
D.	(3 / 153)
Answer» E.

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