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((1/8)*sin(8*x))'The calculation above is a derivative of the function f (x)
(1/8)'*sin(8*x)+(1/8)*(sin(8*x))'
0*sin(8*x)+(1/8)*(sin(8*x))'
0*sin(8*x)+(1/8)*cos(8*x)*(8*x)'
0*sin(8*x)+(1/8)*cos(8*x)*((8)'*x+8*(x)')
0*sin(8*x)+(1/8)*cos(8*x)*(0*x+8*(x)')
0*sin(8*x)+(1/8)*cos(8*x)*(0*x+8*1)
0*sin(8*x)+(1/8)*8*cos(8*x)
cos(8*x)
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