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1-tanA÷1+tanA=1-sin2A÷cos2A​
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1-tanA÷1+tanA=1-sin2A÷cos2A​

User Basedgod
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hope u get it. I've used RHS to prove LHS

1-tanA÷1+tanA=1-sin2A÷cos2A​-example-1
User Pieter Goosen
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