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Prove the following identities: (cosA)/...

Prove the following identities: `(cosA)/(1-tanA)+(sin^2A)/(sinA-cosA)=sinA+cosA`

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Prove the following identities: (cosA)/(1-tanA)+(sinA)/(1-cotA)=cosA+sinA

Prove the following identities: (cosA)/(1-tanA)+(sinA)/(1-cotA)=sinA+cosA

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