$y+xy=x^2y'$
$\frac{senx}{cscx}+\frac{cosx}{senx}$
$3\cdot2n-1+1$
$y\left(4+x^2\right)dy=x\left(2-y^2\right)dx$
$\left(8ab-4\right)\left(8ab+4\right)$
$2a^2-3a+1$
$-10\:-\:\left(\frac{16}{4}\right)^2\:+\:9$
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