$x-23=-8$
$\left(2+7\right)\cdot\left(-2\right)$
$50x^2-20x+2$
$6+3\:cos\left(2x\right)=9\:cos\left(x\right)$
$-6\:+\:-3-\:\left(-18\right)$
$\int x^3\cos\:x^4\:dx$
$sec\left(\arctan\left(4x\right)\right)$
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