$\frac{x^4+2}{x^2+5x+3}$
$x^3+2x^2-14x-3=x^2-3$
$3.8\cdot2.7$
$-4\:-\:5\:+\:-3$
$13a+13a-12b-11a-4b-b$
$( 12 - 3 ) - ( 7 - 5 )$
$l\lim_{x\to0}\:\frac{sin^2\left(2x\right)}{x^2}$
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