$\left(a^2+3y\right)^3$
$-\sqrt{1}+\sqrt{-4-5}$
$x\cdot5-31=49$
$\lim_{x\to-7}\left(\frac{x^2+15x+56}{63-2x+x^2}\right)$
$\lim_{x\to-\infty}\left(2ln\left(-x\right)+4x\right)$
$25a^2+70ab+49b^2$
$x^2-x+1;\:x=0$
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