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