euanmcsparran euanmcsparran

04-03-2021
Mathematics

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Prove it cotA - tanA = 2cot2A

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cn4685643 cn4685643

04-03-2021

Cora-tana=cosa/sina-sina/cosa

= (Cos^2a_sin^2a) / sina.cosa

= 2 cos2a/sina

= 2cot2a

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