$-x+2y=4$
$\:\int\frac{\left(2x+8\right)}{x^3+x^2}dx$
$\frac{x^{-3}}{x^{-9}}$
$2\sin\left(x\right)\tan\left(x\right)+9\tan\left(x\right)=0$
$-\frac{6}{-3}$
$\left(x^2-3x+6\right)\left(-x^3\right)$
$\frac{sin^2x}{cos^4\:x}$
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