A) sin(x - π/6) > 0
arcsin0 + 2πn < x - π/6 < π - arcsin0 + 2πn, n∈Z
2πn < x - π/6 < π + 2πn, n∈Z
π/6 + 2πn < x < π + π/6 + 2πn, n∈Z
π/6 + 2πn < x < 7π/6 + 2πn, n∈Z
<span>б) tgx(x - </span>π/4) ≤ 0
- π/2 + πn ≤ x - π/4 ≤ arctg0 + πn, n∈Z
- π/2 + π/4 + πn ≤ x ≤ π/4 + πn, n∈Z
- π/4 + πn ≤ x ≤ π/4 + πn, n∈Z
<span>у=0,9-0,3х
y=0.9-0.3*(-3)
y=0.9+0.9=1.8</span>
<span>(1/2-9/4)/(1/2-11/4)=(2/4-9/4)/(2/4-11/4)=(-7/4)/(-9/4)=(7/4)/(9/4)=7/4 * 4/9=7/9</span>
Задание решено..............