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Prove that : Cos 2A =cot^2-1/cot^2+1​
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Prove that : Cos 2A =cot^2-1/cot^2+1​

User Takirala
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Explanation:

steps are in the picture.

Note:if you need to ask question about it i am ready to give you answer.

Prove that : Cos 2A =cot^2-1/cot^2+1​-example-1
User Marten Zander
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