$\lim_{x\to\:0}\left(\frac{\arctan\left(x\right)}{senx}\right)$
$y^2-25w^2$
$\frac{tan^2\left(x\right)}{\:sec\left(x\right)}=\frac{1-cos\left(x\right)}{cos\left(x\right)}$
$-1250+-3600$
$c^2+c+1$
$\left(a+b+d\right)^3$
$\int\frac{5x^2}{\sqrt{4x-x^2}}dx$
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