$\lim_{x\to0}\left(x^{-\frac{9}{lnx}}\right)$
$-\left(4h-0.3\right)$
$\:\frac{-36}{-12}$
$\frac{cos^4t-sin^4t}{cos^2t}$
$\frac{3a^{4n}-9b^{2m}}{3b^m+\sqrt{3}a^{2n}}$
$\left(5x^2-3\right)\left(5x^2+9\right)$
$5x\frac{dy}{dx}+4y=7x^2$
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