$\sqrt{14}\left(.\right)\sqrt{668}$
$\left(5x-10\right)\left(5x+8\right)$
$x ^ { 3 } - 2 x ^ { 2 } - 15 x$
$2x^5-5x^4-12^3+23x^2+16x-12$
$\frac{1+2\cos x}{2}=1$
$-\left(4a^2\:+2mx\right)-\left(-5mx-2a^2\right)\:$
$\frac{16\cdot\left(-3\right)^3}{6}$
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