$4\frac{1}{4}-3,5$
$\left(7a-3bc\right)^{2}$
$\left(3c+10cd\right)$
$\lim_{x\to0}\left(\frac{\tan\left(x\right)}{x}\right)$
$2x^2-6x+15$
$\left(1-a\right)\left(1-a\right)\left(1-a\right)$
$\lim_{x\to\frac{\pi}{2}}\left(\cos x\right)^{\frac{1}{2}}$
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