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Math
Posted by
Sarah
on
Monday, November 22, 2010
at 7:01pm.
Prove :cosx-cosy= -2sin(x+y/2)sin(x-y/2)
Prove: 2cot-2tanx= 4-2sec^2x / tanx
Math -
Ajay bharti
, Thursday, December 22, 2016 at 7:09am
2Sinx
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