Question

$tgx > - 1$
решите пожалуйста​

Answer 1

$tgx>-1\\\\arctg(-1)+\pi n<x<\frac{\pi }{2} +\pi n,n\in Z\\\\-arctg1+\pi n <x<\frac{\pi }{2}+\pi n,n\in Z\\\\-\frac{\pi }{4}+\pi n<x<\frac{\pi }{2} +\pi n,n\in Z\\\\x\in(-\frac{\pi }{4}+\pi n;\frac{\pi }{2}+\pi n),n\in Z$