<span>сos(2п-t)= Сos t
sin(3п/2+t) = - Sint
сtg(270-a) = tg t</span>
![\frac{4}{x+3}\geq \frac{1}{5}\\\\\frac{4}{x+3}-\frac{1}{5}\geq 0\\\\\frac{20-x-3}{5(x+3)}\geq0\\\\\frac{x-17}{x+3}\leq 0\\\\\\ \left\{ {{(x-17)(x+3)\leq0 } \atop {x\neq-3 }} \right.](https://tex.z-dn.net/?f=%5Cfrac%7B4%7D%7Bx%2B3%7D%5Cgeq+%5Cfrac%7B1%7D%7B5%7D%5C%5C%5C%5C%5Cfrac%7B4%7D%7Bx%2B3%7D-%5Cfrac%7B1%7D%7B5%7D%5Cgeq+0%5C%5C%5C%5C%5Cfrac%7B20-x-3%7D%7B5%28x%2B3%29%7D%5Cgeq0%5C%5C%5C%5C%5Cfrac%7Bx-17%7D%7Bx%2B3%7D%5Cleq+0%5C%5C%5C%5C%5C%5C+%5Cleft%5C%7B+%7B%7B%28x-17%29%28x%2B3%29%5Cleq0+%7D+%5Catop+%7Bx%5Cneq-3+%7D%7D+%5Cright.)
+ - +
_________(-3)___________[17]__________
///////////////////////////
x ∈ (- 3 ; 17]
1) 5(25-125-625)
2) хз
3) 3(9-27-81-243)
4) хз
<span>(x+y)*(x-y)*(x²-y²)=(х²-у²)(х²-у²)=х⁴-2х²у²+у⁴</span>
X{2}-6/x*(x+2){2} {} - это в квадрате.