$\lim_{x\to0}\left(1-\cos\left(x\right)cos^2x\right)$
$-\left(b-c\right)$
$-9+1x-3$
$\left(2a^2+3b^3\right)\left(2a^2-3b^2\right)$
$f\left(x\right)=2x^2+5x$
$a\left(a-b-c\right)$
$\lim_{x\to0}\left(\frac{2}{x+1}\right)^{\frac{2}{\ln x}}$
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