$\cos\left(x\right)\tan\left(x\right)\sec^2\left(x\right)$
$\left(m-\sqrt{n}\right)\left(m+\sqrt{n}\right)$
$8x^2-1+6x+1$
$7\le12.1-f$
$\int-xe^x\:dx$
$2\cdot3+3-4+8$
$-\left(3\right)^2-\left(-2\right)^3\left(-2\right)^2\left(-2\right)$
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