$sen\left(a+2\pi\right)$
$\frac{c+d}{c^{-1}+d^{-1}}$
$m^2+2m\left(m-n\right)+mn$
$\frac{6}{5}+10.35$
$4y\cdot y'+x=0$
$\ln\left(\sin\left(2x\right)\right)\left(\sqrt{x}^2+1\right)$
$\cos\left(x\right)\tan\left(x\right)-\cos\left(x\right)$
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