Смотрите во вложениях.
Графики в обратном порядке
= cos(2π+π/3)-sin(2π-π/6)= cos(π/3)+sin(π/6)= 1/2+1/2 = 1
<span>
1/7а²b*23m -2/7a²bm=1/7 a²bm(23 - 2) = 21:7 a²bm = 3a²bm</span>
<span /><span>5а²-2аb+6a-7ab-6a²-6a= -a² -9ab = -a(a +9b)</span>
<span>a=5 b= -1/9</span>
<span>-5(5 -9x1/9) = -20</span>