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(-7*sin(7*x-9))'The calculation above is a derivative of the function f (x)
(-7)'*sin(7*x-9)-7*(sin(7*x-9))'
0*sin(7*x-9)-7*(sin(7*x-9))'
0*sin(7*x-9)-7*cos(7*x-9)*(7*x-9)'
0*sin(7*x-9)-7*cos(7*x-9)*((7*x)'+(-9)')
0*sin(7*x-9)-7*cos(7*x-9)*(7*(x)'+(7)'*x+(-9)')
0*sin(7*x-9)-7*cos(7*x-9)*(7*(x)'+0*x+(-9)')
0*sin(7*x-9)-7*cos(7*x-9)*(0*x+7*1+(-9)')
0*sin(7*x-9)-7*(0+7)*cos(7*x-9)
0*sin(7*x-9)-7*7*cos(7*x-9)
-49*cos(7*x-9)
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