2cosx*sinx - sin(2x)=, cos^2(x) - sin^2(x) - cos(2x)=, 2cos^2(x) - 1 - Cos(2x)=, 1- 2sin^2(x) - cos2x=, 4cos^3(x) - 3cosx - cos(3x)=, 3sinx- 4sin^3(x) - sin(3x)=, 2cos((a+b)/2)*cos((a-b)/2) - cos(a)+cos(b)=, 2sin((a+b)/2)*cos((a-b)/2) - sin(a)+sin(b)=, -2sin((a+b)/2)*sin((a-b)/2) - cos(a)-cos(b)=, 2cos((a+b)/2)*sin((a-b)/2) - sin(a)-sin(b)=, (1/2)* [cos(a+b)+cos(a-b)] - cos(a)*cos(b)=, (1/2)* [cos(a-b)-cos(a+b)] - sin(a)*sin(b)=, (1/2)* [sin(a+b)+sin(a-b)] - sin(a)*cos(b)=,

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