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(sin(7*pi*x))'The calculation above is a derivative of the function f (x)
cos(7*pi*x)*(7*pi*x)'
cos(7*pi*x)*((7*pi)'*x+7*pi*(x)')
cos(7*pi*x)*(0*x+7*pi*(x)')
cos(7*pi*x)*(0*x+7*pi*1)
7*pi*cos(7*pi*x)
7*pi*cos(7*pi*x)
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