$\lim x\to0\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$-5t^2+10t+1.7$
$2\left(x+11\right)+1$
$\left(16+4\right)\left(16-4\right)-4$
$9y^2+6y+1=0$
$273+64$
$14-12+14+1-9-1$
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