$\lim_{x\to1}\left(\frac{x^3-2x^2+4x-3}{4x^2-5x+1}\right)$
$\frac{x^{15}}{x^4}+x+1$
$\left(-3\right)\cdot\left(+3\right)\cdot\left(+3\right)\cdot\left(+3\right)$
$v-w=13$
$\left(-b-c\right)\left(b-c\right)$
$\lim_{x\to0}\left(\frac{tan\left(-3x\right)}{2^{5x}-1}\right)$
$2x^2-14x+9$
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