$\sec\left(x\right)+tan\left(x\right)=\frac{1}{sec\left(x\right)-tan\left(x\right)}$
$x-13=44$
$\frac{d}{dx}v=9$
$f\left(x\right)=\left(\frac{e^{3x}+x^2}{x}\right)$
$4x^2+28x+45=0$
$\lim_{x\to0}\left(\sqrt{x^2+6x}-x\right)$
$64-x^{12}$
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