3sin^2x-4sinx*cosx+5cos^2x=2 Решите уравнение
3sin²x-4sinxcosx+5cos²x-2sin²x-2cos²x=0/cos²x tg²x-4tgx+3=0 tgx=a a²-4a+3=0 a1+a2=4 U a1*a2=3 a1=1⇒tgx=1⇒x=π/4+πn,n∈z a2=3⇒tgx=3⇒x=arctg3+πk,k∈z