If cos² a - sin² a = tan² B, then the value of cos²B-sin²B is : – McqOptions

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1.	If cos² a - sin² a = tan² B, then the value of cos²B-sin²B is :
A.	Cot² a
B.	cot²B
C.	tan² a
D.	tan² B
Answer» D. tan² B

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