(U*V)'=U'V+UV'; (√Х)'=1/(2√X); (ARCTGU)'=(1/(1+U²))*U'
(√x*arctg(1/x))'=(arctg(1/x))/(2√x)+√x*(1/(1+(1/x)²)*(-1/x²)=
(arctg(1/x))/(2√x)-√x*(1/(1+x²)
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(U*V)'=U'V+UV'; (√Х)'=1/(2√X); (ARCTGU)'=(1/(1+U²))*U'
(√x*arctg(1/x))'=(arctg(1/x))/(2√x)+√x*(1/(1+(1/x)²)*(-1/x²)=
(arctg(1/x))/(2√x)-√x*(1/(1+x²)