Asked by Sarah
Prove :cosx-cosy= -2sin(x+y/2)sin(x-y/2)
Prove: 2cot-2tanx= 4-2sec^2x / tanx
Prove: 2cot-2tanx= 4-2sec^2x / tanx
Answers
Answered by
Ajay bharti
2Sinx
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