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

MCQOPTIONS

1.	Evaluate the expression cos^4 x - sin^4 x , given that cos^2 x - sin^2 x = 7 / 9
A.	(7 / 11)
B.	(7 / 9)
C.	(7 / 121)
D.	(7 / 131)
Answer» C. (7 / 121)

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