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(5*ln(cos(x)))'The calculation above is a derivative of the function f (x)
(5)'*ln(cos(x))+5*(ln(cos(x)))'
0*ln(cos(x))+5*(ln(cos(x)))'
0*ln(cos(x))+5*(1/cos(x))*(cos(x))'
0*ln(cos(x))+5*(1/cos(x))*(-sin(x))
0*ln(cos(x))+5*(-((cos(x))^-1*sin(x)))
-5*(cos(x))^-1*sin(x)
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