$\lim_{x\to\infty}\left(\frac{2n-1}{3^n}\right)$
$\left(-10+9y\right)\left(10+9y\right)$
$8x^2-y^2=1$
$\left(tanxsin2y\right)dy=\left(sin^2x+cos^2x\right)dx$
$\int\left(9y^5\sqrt{2\:-\:9y^6}\right)dy$
$36x^2-19x-42$
$\frac{x^2-9x-10}{x+1}$
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