$x\left(x+13\right)=30$
$\left(x-2\right)^2=x^2-2x+2$
$4\sqrt{2x^4y}$
$\frac{\sin x\cdot\cot^2x}{\cos x}$
$5a^2b^3\left(ab^2-a^2b+4a\right)$
$-2\left(3\right)\left(2\right)-3\left(3\right)\left(2\right)+10$
$\sqrt{81x^2+81}$
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