$a^2-3a+5a+-15$
$\lim_{x\to4}\frac{x^2+5x+4}{x+4}$
$\left(3x+5\right)^2\left(3\right)$
$x\:-4\:+\:x\:+9$
$\frac{sinx}{cos^3x-cosx}$
$x^2-17x=0$
$( x ^ { 3 } + 3 y ) ^ { 2 }$
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