$-843+-641$
$\lim_{x\to4}\left(\frac{x^2-8x+15}{x^2-7x+12}\right)$
$3y^2+5x+4x^2=\left(5x+2\right)$
$256x^2-64x+4$
$-2.5\left(4x-3\right)$
$\int\left(4ay\left(6+y^{\frac{3}{2}}\right)\right)dy$
$\int_{-1}^2\sqrt{1+x^4+2x^2}dx$
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