euanmcsparran
euanmcsparran
04-03-2021
Mathematics
contestada
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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