Question

(tg² x - 3) √11cos x = 0

Answer 1

сosx≥0⇒x∈[-π/2+2πn;π/2+2πn,n∈Z]
cosx=0⇒x=π/2+πn,n∈z
tg²x-3=0
tg²x=3
tgx=-√3⇒x=-π/3+2πn,n∈Z
tgx=√3⇒x=π/3+2πn,n∈Z