$\frac{64^6-343\:y^9}{4^2-7\:y^3}$
$4x\le\frac{7}{9}$
$x^2-x-26=9x-2$
$10x+9=4x-9$
$-9f-8-10$
$\frac{\left(2sin\left(x\right)+1\right)}{\left(cos^2\left(x\right)sin\left(x\right)\right)}$
$\lim_{x\to1}\left(\frac{x^2-1}{sin\left(x-1\right)}\right)$
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