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(cos(0.75*x))'The calculation above is a derivative of the function f (x)
-sin(0.75*x)*(0.75*x)'
-sin(0.75*x)*((0.75)'*x+0.75*(x)')
-sin(0.75*x)*(0*x+0.75*(x)')
-sin(0.75*x)*(0*x+0.75*1)
0.75*(-sin(0.75*x))
-0.75*sin(0.75*x)
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