$\lim_{x\to0}\frac{e^x+e^{-x}-2\cos\left(x\right)}{\sin\left(x^2\right)}$
$\frac{12}{5}-\frac{2}{5}$
$\frac{2\cos x\left(1-\cos^2x\right)}{2\text{senx}\cos x}=\text{senx}$
$\left(x^2+1\right)\cdot\:2x-\:\left(x-1\right)^2\:\cdot\:2x$
$a^2-14a-4a$
$\frac{d}{dx}x^2y-y^2=3$
$2x-3y-5x$
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