Cot2a+tan2a/cot2a-tan2a=sec4a
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Step-by-step explanation:
at LHS write cot 2a=cos2a/sin2a
tan 2a=sin2a/cos 2a
then do LCM and simply by using Cos(a+b)=Cosa Cosb-Sina Sinb and Cos(a-b)=Cosa Cosb +Sina Sinb formula then u get sec 4a
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