$\left(x+a\right)^2-\left(x-a\right)^2$
$3x+5>x-1$
$\int\frac{x+1}{\left(x-1\right)\left(x^2+2x+4\right)}dx$
$\int\cot^{3}\left(x-1\right)\tan^{3}\left(x-1\right)dx$
$\left(8\times10^{7}\right)\left(7\times10^{4}\right)$
$\frac{xy}{xy}$
$25y^2-16x^4$
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