$\left(1+\tan\left(a\right)^2\right)\cos\left(a\right)^2$
$\left(5\right)-\left(+7\right)\cdot\left(-2\right)+\left(+5\right)-\left(-3\right)$
$\int\:\frac{1}{\sqrt{7-x^2+6x}}dx$
$12x-36x+2x$
$m-3\le17$
$30x^4+60x^3-60x^2$
$6x\left(-10\right)$
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