$18y+15y-15-+y$
$\cos\left(\frac{11\pi}{12}\right)como\:\cos\left(\frac{\pi}{4}\right)$
$\left(a-1\right)\left(5a^{2}+a+6\right)$
$\left(4+n\right)^2$
$\frac{x^3+4x^2+5x-1}{x+5}$
$\ln\left(4x^2+4\right)-\ln4x^2=4$
$7x-\:1\le10x+4$
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