$\left(9x^2+7-8\right)-\left(6x^2+15x-5\right)$
$\int\frac{\sqrt{\left(81-x^2\right)}}{x}dx$
$b^2-4b$
$\left(m-7\right)^2$
$\cos\left(113\right)\cos\left(67\right)$
$\left(7+8\right)\left[\left(-4\right)+\left(-2\right)\left(-2\right)\right]$
$\int3a^2x^6dx$
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