$31-24-12+45-23+1$
$a^2-\left(b-c\right)^2$
$sinasinb=0.5\left[cos\left(a-b\right)-cos\left(a+b\right)\right]$
$\left(3x+abc\right)^2$
$-x-7+-5x+5$
$\frac{26x^2+6x-9}{x^2+1}$
$\lim\:_{x\to\:\infty\:}\left(\frac{20x^2+3x+7}{\sqrt{25x^4+3x^3}}\right)$
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