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