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(cos(2*x+pi))'The calculation above is a derivative of the function f (x)
-sin(2*x+pi)*(2*x+pi)'
-sin(2*x+pi)*((2*x)'+(pi)')
-sin(2*x+pi)*(2*(x)'+(2)'*x+(pi)')
-sin(2*x+pi)*(2*(x)'+0*x+(pi)')
-sin(2*x+pi)*(0*x+(pi)'+2*1)
(0+2)*(-sin(2*x+pi))
2*(-sin(2*x+pi))
-2*sin(2*x+pi)
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