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(-tan(0.5*x))'The calculation above is a derivative of the function f (x)
(0.5*x)'/((cos(0.5*x))^2)
((0.5)'*x+0.5*(x)')/((cos(0.5*x))^2)
(0*x+0.5*(x)')/((cos(0.5*x))^2)
(0*x+0.5*1)/((cos(0.5*x))^2)
-0.5*(cos(0.5*x))^-2
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