$\frac{7x^3+2x}{9x}$
$\left(4k\:-\:9h\right)^2$
$\frac{x^5-3x^3+4x^2-1}{x^2+1}$
$\cot\left(\frac{\pi}{12}+x\right)=\tan\left(\frac{5\pi}{12}-x\right)$
$2x^4.\frac{3}{4}$
$4x-x^2-12<ma$
$7a\left(3a-2c+4\right)$
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