$20a^2+23a-21$
$3\cdot\left(-5\right)-2\cdot\left(-2\right)+5\cdot10$
$-2.12-4.3$
$\int\tan\left(2x\right)\sec^2\left(2x\right)dx$
$\left(x\sqrt{3yx^2}\right)^2$
$\left(-1\right)\:.\:\left(-3\right)\:.\:\left(-12\right)\:$
$\left(5a-3\right)^2$
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