How do you differentiate $arctan(x/2)$ ?

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Answer 1 · 2017-10-22T10:39:50

$2/(x^2+4)$

$arctan(x/2)=tan^-1(x/2)$ the derivative of $tan^-1(x/2)=1/(1+(x/2)^2)=1/(1+x^2/4)1/2=1/2(4/(4+x^2))=2/(4+x^2$

How do you differentiate arctan(x/2)arctan(x/2)?