y=√(tg(x)):x^2+1
(u/v)'=(u'v-v'u)/v^2
y ' =(1/(2*sqrt(tg(x)))*1/cos(x)^2*(x^2+1)-sqrt(tan(x))*2*x)/(x^2+1)^2
y=√(tg(x)):x^2+1
(u/v)'=(u'v-v'u)/v^2
y ' =(1/(2*sqrt(tg(x)))*1/cos(x)^2*(x^2+1)-sqrt(tan(x))*2*x)/(x^2+1)^2