$-12x+8\ge2x-2$
$\int\left(\frac{4x+3}{2x^2+2x+1}\right)dx$
$\frac{81-16x^4}{3+2x}$
$\frac{d}{dx}\ln x\cos x$
$\sqrt{1}9$
$x^2+16x=17$
$2^{x+2}-6\cdot2^{x+1}=-64$
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