Помогите решить.) ^- это если что корень. 3. sin^2 x + 6sin x cos x + 8 cos^2 x = 0 5. 2cos^2 x – 11sin 2x = 12 6. 2sin^2 x – 3sin 2x – 4cos 2x = 4

3. sin^2 x + 6sin x cos x + 8 cos^2 x = 0/cos²x tg²x+6tgx+8=0 tgx=a a²+6a+8=0 a1+a2=-6 U a1*a2=8 a1=-4⇒tgx=-4⇒x=-arctg4+πk,k∈z a2=-2⇒tgx=-2⇒x=-arctg2+πn,n∈z 5. 2cos^2 x – 11sin 2x = 12 2cos²x-22sinxcosx-12sin²x-12cos²x=0/cos²x 12tg²x+22tgx+10=0 6tg²x+11tgx+5=0 tgx=a 6a²+11a+5=0 D=121-120=1 a1=(-11-1)/12=-1⇒tgx=-1⇒x=-π/4+πn,n∈z a2=(-11+1)/12=-5/6⇒tgx=-5/6⇒x=-arctg5/6+πk,k∈z 6. 2sin^2 x – 3sin 2x – 4cos 2x = 4 2sin²x-6sinxcosx-4cos²x+4sin²x-4sin²x-4cos²x=0/cos²x 2tg²x-6tgx-8=0 tg²x-3tgx-4=0 tgx=a a²-3a-4=0 a1+a2=3 U a1*a2=-4 a1=-1⇒tgx=-1⇒x=-π/4+πk,k∈z a2=4⇒tgx=4⇒x=arctg4+πn,n∈z