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Question

Prove that:
(1+tan2A1+cot2A)=(1tanAcotA)2=tan2A

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Solution

1+tan2A1+cot2A=1+tan2A1+1tan2A=(1+tan2A)tan2A1+tan2A=tan2A
(1tanAcotA)2=1+sinAcosAcosAsinA
(1tanA1/tanA)2=tanAtan2A=tan2A

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