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(cos(0.23*x))'The calculation above is a derivative of the function f (x)
-sin(0.23*x)*(0.23*x)'
-sin(0.23*x)*((0.23)'*x+0.23*(x)')
-sin(0.23*x)*(0*x+0.23*(x)')
-sin(0.23*x)*(0*x+0.23*1)
0.23*(-sin(0.23*x))
-0.23*sin(0.23*x)
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