$x^3+w^3$
$r=x+y$
$a^3+b^3=20$
$\int_0^{2\pi}\left(\sqrt{1-\cos^2\left(x\right)}\right)dx$
$y'=\frac{3x}{2y}$
$\int\frac{\senx}{e\cos x}dx$
$\lim_{x\to0}2+\frac{5}{x^2}$
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