atana
1- Cos2x + sinx/ sinx + cosx
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(1+cos^2x/2)sinx/ sinx-cosx
=1/2 sinx/sinx-cosx + 1/2 cos^2x.sinx/sinx-cosx
=sinx/sinx-cosx
sinx=A(cosx+sinx)+B(sinx-cosx)
A=1/2, B=1/2.
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