$\left(3t^4-7\right)^2$
$\left(\left(\frac{2}{3}\right)^{-3}\right)^2$
$3x+4=1x+12$
$\:\left(-189\right)-\left(-1237\right)$
$\lim_{x\to0}\left(\frac{\sqrt{x+3}-\sqrt{3}}{\sqrt{x+5}-\sqrt{5}}\right)$
$-a^2b^2-a^2$
$3x^3\cdot50y^4$
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