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(315*sin(20*x))'The calculation above is a derivative of the function f (x)
(315)'*sin(20*x)+315*(sin(20*x))'
0*sin(20*x)+315*(sin(20*x))'
0*sin(20*x)+315*cos(20*x)*(20*x)'
0*sin(20*x)+315*cos(20*x)*((20)'*x+20*(x)')
0*sin(20*x)+315*cos(20*x)*(0*x+20*(x)')
0*sin(20*x)+315*cos(20*x)*(0*x+20*1)
0*sin(20*x)+315*20*cos(20*x)
6300*cos(20*x)
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