$\int cot\left(2x+5\right)dx$
$4 x ^ { 10 } - 36 \times 5 + 81$
$2x+6<-2$
$\int\frac{1+\frac{\sqrt{x}}{2}}{1+\frac{\sqrt{x}}{3}}dy$
$x^2+y^2+3z^2=8$
$x^3+6x^2+9x+4$
$x^2-x^{-2}=0$
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