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(sin(3*x-pi))'The calculation above is a derivative of the function f (x)
cos(3*x-pi)*(3*x-pi)'
cos(3*x-pi)*((3*x)'+(-pi)')
cos(3*x-pi)*(3*(x)'+(3)'*x+(-pi)')
cos(3*x-pi)*(3*(x)'+0*x+(-pi)')
cos(3*x-pi)*(0*x+(-pi)'+3*1)
(0+3)*cos(3*x-pi)
3*cos(3*x-pi)
3*cos(3*x-pi)
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