$\frac { x ^ { 4 } - 3 x - 5 } { x - 2 }$
$\left(3x-7\right)\left(2x-13\right)$
$x^2+0.000018x-0.00000000369$
$\lim_{x\to-1}\left(0\right)$
$\left(x+3i\right)\left(x-3i\right)\left(x+2i\right)\left(x-2i\right)$
$\frac { c } { 20 } \leq 20$
$\tan\left(x\right)\cdot\sin\left(2x\right)=\sin\left(x\right)^2$
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