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Question

Prove the following trignometric identities:

cos2A+11+cot2A=1

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Solution

We know that,

cos2θ+sin2θ=1

cosec2θcot2θ=1

So, cos2A+11+cot2A=cos2A+1cosec2A

=cos2A+1(cosecA)2 = cos2θ+sin2θ

= 1


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