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Prove that
cotA-tanA/cotA+tanA=2cot2A
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Step-by-step explanation:
cotA-tanA/cotA+tanA=2cot2A
divide an multiply nuretaor and denomenatorcota+tana
LHS=
=cotA-tanA*cotA+tanA/cotA+tanA*cotA+tanA
=cot^2A-tan^2A/cot^2A+tan^2A+2tanAcotA
=cos^4A-sin^4A/cos^2A.sin^2A/cos^4A+sin^4A+2sin^2A.cos^2A/sin^2A.cos^2A
=
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