$-x^2+8x-7>0$
$\frac{21ab^2}{3ab^2}$
$y=cos\left(a^3+x^3\right)$
$x^2-3x-5$
$x^2+16x-42=0$
$\lim_{x\to0}\left(\frac{e^{3x}-\sin\left(3x\right)-1}{x\cdot\sin\left(5x\right)+8x^2}\right)$
$\left(8a^3b^2\right)\left(2a^{-4}b^{-5}\right)$
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