$\sec\left(u\right)\cdot\sec\left(y\right)-1$
$\frac{\left(4a+10\right)}{3b-5};\:a=-3;\:b=4$
$\frac{7x+5}{4x-2}$
$\left(2r^2+1\right)\left(r^3-7\right)$
$\frac{d}{dx}\frac{5x+1}{7x-2}$
$\left(8u^2+2n\right)$
$\left(+20\right)-\left(-15\right)$
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