$\frac{3x^3y^{-4}}{3xy^2}$
$\frac{90}{-a}=5$
$x^2+2x-24=9$
$2x^2-18x+36$
$\int\tan^4\left(x\right)\sin^2\left(x\right)dx$
$y''+7y'+12y=0$
$\lim\:_{x\to\:0}\:\left(e^{\frac{4}{x}\ln\:\left(1+x^2\right)}\right)$
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