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(cos(30-(3*x)))'The calculation above is a derivative of the function f (x)
-sin(30-(3*x))*(30-(3*x))'
-sin(30-(3*x))*((-(3*x))'+(30)')
-sin(30-(3*x))*(3*(x)'+(3)'*x+(30)')
-sin(30-(3*x))*(3*(x)'+0*x+(30)')
-sin(30-(3*x))*(0*x+3*1+(30)')
(0-3)*(-sin(30-(3*x)))
-3*(-sin(30-(3*x)))
3*sin(30-(3*x))
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