$2x+3<3x+7$
$\frac{d}{dx}x\sqrt{x^2+45}$
$\int-3x\:\cos\left(4x\right)\:dx$
$\int\sec^55x\:\tan^35x\:dx$
$\frac{d}{dx}-2x^4-x^3+7x$
$4\left(n\:-\:5\right)\:-\:2\left(n\:+\:20\right)\:\le\:1500$
$-\left(-\frac{1}{-\infty}\right)$
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