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(2*sin(-2*x))'The calculation above is a derivative of the function f (x)
(2)'*sin(-2*x)+2*(sin(-2*x))'
0*sin(-2*x)+2*(sin(-2*x))'
0*sin(-2*x)+2*cos(-2*x)*(-2*x)'
0*sin(-2*x)+2*cos(-2*x)*((-2)'*x-2*(x)')
0*sin(-2*x)+2*cos(-2*x)*(0*x-2*(x)')
0*sin(-2*x)+2*cos(-2*x)*(0*x-2*1)
0*sin(-2*x)+2*-2*cos(-2*x)
-4*cos(-2*x)
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