$\lim_{x\to-\frac{1}{3}}\left(\frac{4x^3-5x^2-3x}{5x^3+3x^2}\right)$
$\sin^4a-cos^4a$
$\frac{d}{dx}bihuhb$
$4^54^{-3}$
$\int\left(x^2+2\right)\left(x+3\right)^2dx$
$\tan\left(\frac{x}{2}\right)+\ctgx^{-1}$
$\lim_{x\to1}\:\frac{x}{x-2}$
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