зачетная работа
помогите триганометрия!4 и 5 задания

4sin²(x-π)+6cos(x-π/2)*cos(x+π)+8sin(x-3π/2)=0sin²x+6sinx*(-cosx)+8cos²x=0/cos²xtg²x-6tgx+8=0tgx=aa²-6a+8=0a1+a2=6 U a1*a2=8a1=2⇒tgx=2⇒x=arctg2+πn,n∈za2=4⇒x=arctg4+πk,k∈z5ctg²(x-π/2)-ctg(x-3π/2)-2=0tg²x+tgx-2=0tgx=aa²+a-2=0a1+a2=-1 U a18a2=-2a1=-2⇒tgx=-2⇒x=-arctg2+πn,n∈za2=1⇒tgx=1⇒x=π/4+πk,k∈z