Prove the following identities: tan^2A-t...

Prove the following identities: `tan^2A-tan^2B=(cos^2B-cos^2A)/(cos^2Bcos^2A)=(sin^2A-sin^2B)/(cos^2Acos^2B)` `(sinA-sinB)/(cosA+cosB)+(cosA-cosB)/(sinA+sinB)=0`

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