$\int\frac{2x+1}{x^2+x-2\:}dx$
$5^2\cdot8^4-3^3$
$8x<16$
$\sqrt{\left(\frac{a^2-x^2}{x^2}\right)}$
$\int_{-3}^3\frac{81}{x^2+9}dx$
$5\cdot2-6\left(-3\right)+\left(-7\right)\left(-10\right)\left(-2\right)-18$
$\frac{dy}{dx}-x=x^2-y$
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