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