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(10*20*cos(x)*sin(x))'The calculation above is a derivative of the function f (x)
(10*20*cos(x))'*sin(x)+10*20*cos(x)*(sin(x))'
((10*20)'*cos(x)+10*20*(cos(x))')*sin(x)+10*20*cos(x)*(sin(x))'
(0*cos(x)+10*20*(cos(x))')*sin(x)+10*20*cos(x)*(sin(x))'
(0*cos(x)+10*20*(-sin(x)))*sin(x)+10*20*cos(x)*(sin(x))'
10*20*cos(x)*(sin(x))'-200*sin(x)*sin(x)
10*20*cos(x)*cos(x)-200*sin(x)*sin(x)
200*(cos(x))^2-(200*(sin(x))^2)
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