$k=\frac{-sen^2x}{2senx\:cosx}$
$\frac{d}{dx}\left(x^4-y^5=0\right)$
$4x+1<2$
$3+5x+8-2x$
$x^6+20x^4-x^2$
$100b^{12}a^2-225$
$2x+4=3x-10$
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