Question

Решите ! y'=e^(x+y)+e^(x-y) y(0)=0

Answer 1

$y' = e^x(e^y+e^{-y})\\\\ \frac{dy}{e^y+e^{-y}} =e^xdx\\\\ \frac{e^ydy}{a^{2y}+1} =e^xdx\\\\ arctg(e^y)=e^x + C\\\\ y(0)=0\\\\ arctg(e^0)=e^0+C=0\\\\ \frac{ \pi }{4} =1+C\\\\ C= \frac{ \pi -4}{4} \\\\ arctg(e^y)=e^x- \frac{4- \pi }{4}$