$x^2\ge1$
$3t^{6}\cdot8t^{-6}$
$1+\frac{1}{\tan^2a}$
$\int\frac{6x-7x^2}{\left(x+1\right)^2}dx$
$-12a+4-10a$
$\left(1b^2\right)$
$3a^2-3ac+2ba-2bc-ac+c^2$
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