$81n^2-49$
$\left|1\right|>\left|-3\right|$
$\int\:\frac{x+4}{x^2+5x-6}dx$
$-\frac{1}{3}\:.\:3$
$\left(\frac{-9x^5}{7y^2}\right)^2$
$x^2-1-8x^4-3x^2+5x+4-5x^4+2x^2-4x$
$ax\left(bx+ay\right)+by\left(ay+bx\right)$
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