$f\left(x\right)=7\left(-5\right)^2+12\left(-5\right)+5$
$sec\left(x-0.87266\right)=2.15$
$\frac{d^2}{dx^2}\left(\frac{x+4}{x}\right)$
$5x+12\:con\:x=5$
$ab+5a^2b^2$
$\int_2^{\infty}\left(\frac{1}{10}\right)dx$
$3x^{2}-75y^{2}$
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