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Prove that tan^2A/tan^2A-1+cosec^2A/sec^2A-cosec^2A=1/1-2cos^2A​
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Prove that tan^2A/tan^2A-1+cosec^2A/sec^2A-cosec^2A=1/1-2cos^2A​

User Gusgard
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Prove: <br>

cosec2 A-cos2 A=sec2A -sin2 Atan2A

User Ksm
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