$1a$
$2x^2-11x-5$
$\frac{5}{2}\cos\left(\theta\right)$
$y=\left(-x+1\right)^2+5\left(x-1\right)+6$
$\lim_{x\to0.9}\left(\frac{1-\cos\left(x\right)}{x}\right)$
$-1+-10+12+-1+30$
$7\sqrt{3+2}$
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