1) x1=0, x2=2
2)x=-9, x2=1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-4/9 х^2=-9
4/9 х^2=9
Х^2= 9 : 4/9
Х^2= 9* 9/4
Х= 3*3/2= 9/2= 4.5.
<em><u>Ответ</u></em><em><u>:</u></em><em><u>4</u></em><em><u>.</u></em><em><u>5</u></em>
1) <span>ctg x - tg x = (cos x - sin x) / (1/2*sin 2x)
x ∈ {2*пи*k, 2*пи*k-1065/452}, k ∈ Z
2) </span><span>sin^2 x *(tg x+1)+3sin(cos x - sin x)+3=0</span><span>
x ∈ ∅
</span>