$\int\left(\left(x^3-3\right)^23x^2\right)dx$
$\frac{15x}{3x-9}$
$18+\left|13+4-\left(5-7\right)+6\right|$
$3\cot\left(x\right)=9$
$\sqrt{x+2}-\sqrt{2x+2}+1=0$
$\lim_{x\to0}\:\frac{x\left(4+sinx\right)}{x^2+6}$
$\csc^2x-2\csc x=0$
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