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(cos(pi*x-18))'The calculation above is a derivative of the function f (x)
-sin(pi*x-18)*(pi*x-18)'
-sin(pi*x-18)*((pi*x)'+(-18)')
-sin(pi*x-18)*(pi*(x)'+(pi)'*x+(-18)')
-sin(pi*x-18)*(pi*(x)'+0*x+(-18)')
-sin(pi*x-18)*(0*x+pi*1+(-18)')
(pi+0)*(-sin(pi*x-18))
pi*(-sin(pi*x-18))
-(pi*sin(pi*x-18))
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