$2\sec^2x-\sec^4x$
$5\left(9t+3\right)$
$\lim_{x\to0}\left(\frac{e^{2x}-2x-1}{1-cosx}\right)$
$\frac{20.784609690826528}{3}$
$4x^3\cdot0.5x^2-3x-1$
$t^2-t$
$3x+2y+\left(2x+y\right)\frac{dy}{dx}$
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