If A + B = 90 , then tanA . tanB + tanA . cotB = sin B = ?sinA . sec – McqOptions

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1.	If A + B = 90 , then tanA . tanB + tanA . cotB = sin B = ?sinA . secBcos A
A.	2 tan A
B.	tan A
C.
D.	tan A
E.	2cot B
Answer» C.

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