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