Question

tg фи=1, фи принадлежит (p/2, 3p/2) ????

Answer 1

$tgvarphi =1; ; to ; ; varphi =frac{pi}{4}+pi n; ,; nin Z\\varphi in Big (frac{pi }{2}, frac{3pi }{2}, Big ); ; to ; ; varphi =frac{pi }{4}+pi =frac{5pi }{4}$