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(sin(4*x-2))'The calculation above is a derivative of the function f (x)
cos(4*x-2)*(4*x-2)'
cos(4*x-2)*((4*x)'+(-2)')
cos(4*x-2)*(4*(x)'+(4)'*x+(-2)')
cos(4*x-2)*(4*(x)'+0*x+(-2)')
cos(4*x-2)*(0*x+4*1+(-2)')
(0+4)*cos(4*x-2)
4*cos(4*x-2)
4*cos(4*x-2)
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