$\int2x\sqrt{4x-5}dx$
$\frac{\left(3x+21\right)\left(3x-2\right)}{3}$
$\frac{-72}{9}$
$4x^2+4y^2-20x+40x=-5$
$-2\cdot5\cdot3$
$\lim_{x\to0}\:\frac{x-tanx}{x-senx}$
$\frac{-36x^3y^2-24x^2y^2\:\:}{-12x^23y^2}$
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