Question

tg2x+5tgx-6=0 tg во второй степени

Answer 1

tgx=a
a²+5a-6=0
a1+a2=-5 U x1*x2=-6
a1=-6⇒tgx=-6⇒x=-arctg6+πn
a2=1⇒tgx=1⇒x=π/4+πn