$\lim_{x\to\frac{\pi}{2}}\left(\frac{1+sec\left(x\right)}{tan\left(x\right)}\right)$
$\int_{-5}^1\left(x^2e^x\right)dx$
$16m^2+4m-2$
$x^2+4x+1\cdot2$
$\left(a^2\:m-b^2\:n\right)^2$
$25z^2-9k^2$
$y=\frac{1}{4}\sqrt{5x}$
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