$\frac{d}{dx}y^5-3x^2y^2+5x^4=12$
$37.8-10.8$
$\sin0\:.\:cot\:0=cos\:0$
$cos\left(-t\right)=\cos\left(t\right)$
$sen\:a\cdot\:cos\:a=1$
$4.2\cdot5.18$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{\cos\left(2x\right)}{\cot\left(2x\right)}\right)$
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