$\left(8a^5b^{-3}c^7\right)\left(9a^2b^9c\right)$
$xy'+y^2+y=0$
$\frac{x-1}{x^2-1x}$
$\lim\:_{x\to\:0}\frac{\left(secx.tan2x\right)}{xcosecx.cot4x}$
$\frac{y\left(0.\:021+y\right)}{0.\:021-y}$
$\left(x+19\right)^2$
$2c^3+3c^2-2c-3$
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