prove
Asked by | 24th Apr, 2008, 06:56: PM
Expert Answer:
cosec4 A - cosec2 A = cot4A + cot2
RHS
(cosec2A)2 - cosec2A
= cosec2A ( cosec2 -- 1)
=(1 + cot2A) cot2A
cot2A + cot4A = LHS
tanA + tan B /cot A + cot B =tan A tan B
RHS
tan A + tan B / cot A + cot B
=tan A + tan B / 1/ tan A + 1/ tan B
=tan A + tan B / tan A + tan B /tan A tan B
= ( tan A + tan B ) ( tan A Tan B) /tan A + tan B
tan A tan B = LHS
Answered by | 24th Apr, 2008, 10:13: PM
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