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Prove :cosx-cosy= -2sin(x+y/2)sin(x-y/2)

Prove: 2cot-2tanx= 4-2sec^2x / tanx
14 years ago

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Answered by Ajay bharti
2Sinx
8 years ago
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Prove :cosx-cosy= -2sin(x+y/2)sin(x-y/2)

Prove: 2cot-2tanx= 4-2sec^2x / tanx

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