$xy-3y+4x^2=7$
$x^2-17x=0$
$x\left(\sec\left(x\right)-\csc\left(x\right)\right)$
$5ab+10bc+15bd$
$\lim_{x\to\infty}\:\left[\frac{\left(3x\right)}{3-x}\right]$
$\frac{8x^4-6x^2+x}{2x^2-3}$
$\lim_{x\to0}\left(1+\frac{8}{x}\right)^{\left(\frac{x}{2}\right)}$
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