$a^2-1.4+0.49$
$\left(5x^2-7y^2-4xy\right)\cdot\left(3x-2y\right)$
$4xy\:-\:4xz\:+\:7xy\:-\:11yz\:$
$\lim_{x\to\frac{\pi}{2}}\left(sec\left(x\right)-tan\left(x\right)\right)$
$\frac{3x-5}{3-x}\le1$
$\left(4x-15\right)\left(4x+5\right)$
$\frac{x^2+4x+5}{x+3}$
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