$2^2-3y$
$\frac{d}{dx}\left(y=cos^{-1}\left(9x^4\right)\right)$
$2b^2-8b^2+4b$
$\left(a^3\right)^{-3}$
$9\cos^2x-4$
$\sqrt{12}+4senx=0$
$\lim_{x\to-0.1}\left(\frac{sen2x}{x}\right)$
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