plz solve this question
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Answer:
solved LHS
in fourth line used identity a²- b² = (a+b)(a-b)
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Answer:
LHS
=cot A-1/2-(1+tan2A)
=cotA-1/1-tan2A
=cos A-1sinA/1-sin2A/cos2A
=cosA-sinA/sinA
=cotA×cosA-sinA/(cosA+sinA)(cosA-sinA)
=cotA/cosA/cosA+sinA/cosA
=cotA/1+tanA
RHS=LHS
Hence Proved
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