$e^{x+3y}dy=xdx$
$\lim_{x\to0}\left(\left(\frac{x^2}{4+x^2}\right)sin\left(\frac{1}{x}\right)\right)$
$\int\frac{2}{5}dx$
$\frac{1}{2\:}\left(k\right)\left(k+1\right)+k+1$
$\left(a^2+5x-8y+15\right)+\left(5a^2-3x+y-2\right)$
$28+56t+28w$
$-119\cdot19$
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