$\sqrt{\frac{90a^2}{169}}$
$\int\frac{12x+7}{\left(x-2\right)^2}dx$
$\left(-41\right)\left(-26\right)$
$x^2+8x+18=0$
$\frac{\frac{1}{2}}{\frac{1}{\infty}}$
$\left(8^3\right)\left(8^{11}\right)$
$\frac{x}{2\sqrt{a^2+x^2}}-\sqrt{a^2+x^2}$
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