$\frac{dy}{dx}=\:1\:-\:y$
$\lim_{x\to-1}\left(\frac{x^2-x-2}{x-1}\right)$
$x+8\cdot2$
$6x+9y=15$
$\int_o^{\frac{\pi}{4}}\left(secx\right)dx$
$\left(-12\right)+\left(-6\right)-\left(-7\right)$
$3^2-5^2$
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