(tg² x - 3) √11cos x = 0

сosx≥0⇒x∈[-π/2+2πn;π/2+2πn,n∈Z]cosx=0⇒x=π/2+πn,n∈ztg²x-3=0tg²x=3tgx=-√3⇒x=-π/3+2πn,n∈Ztgx=√3⇒x=π/3+2πn,n∈Z