$3+5+\left(4+6\right)+7$
$\left(2x-1\right)\left(-5x+1\right)$
$1-\left(6-50-50\right)$
$16-\left(8+4\right)$
$\int_{\frac{\pi}{6}}^{\frac{\pi}{3}}\left(sin^2x\right)dx$
$49x^2-28x-21$
$-7+\left(-1\right).\left(-1\right)$
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