$4cos\left(2x\right)=4cos^2\left(x\right)-2$
$\left(x+12\right)\left(x+8\right)$
$\left(x+4\right)\left(x+5\right)-20$
$\lim_{x\to0}\left(\sin\left(x\right)\ln\left(x\right)\right)$
$-2\:sen\:x\:+\:1\:=\:0\:\:$
$\frac{dy}{dx}-\frac{1}{x}=x\sin\left(x\right)$
$\frac{dy}{dx}=5y^2\cdot\cos\left(x\right)$
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