$257\cdot4$
$\arctan\left(\frac{29}{29}\right)$
$\left[ye^{-x}-sen\left(x\right)\right]dx\:-\left(e^{-x}+2y\right)dy=0$
$\left(2^2\cdot2^3\right)^1$
$x^2+2cx+c^2=\left(x+c\right)^2$
$16x^2-144$
$\lim_{x\to0}\left(\frac{7x^2}{lnsec\left(x\right)}\right)$
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