$\int_0^{2x}\left(\frac{xy}{x^2+y^2}\right)dx$
$\frac{\sin\left(x^2\right)+\cos\left(x^2\right)+\cos\left(x\right)\sin\left(x\right)}{\cos\left(x\right)\sin\left(x\right)}$
$\lim_{x\to0}\left(\frac{5x-\sqrt{5}}{x}\right)$
$\left(x+2y-1\right)dx+\left(2x+4y-3\right)dy=0$
$-5senx+2=0$
$-5ydy=3dt$
$dy=2u\left(y^2+9\right)du$
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