$0.0354+0.00453$
$36n^2-66n+121$
$0.25k-k$
$72=6b$
$\lim_{x\to0}\:\frac{\left(\left(2+x\right)^2-5\left(2+x\right)-6\right)}{x}$
$5\cdot\cos\left(2x\right)+1=3\cdot\cos\left(2x\right)$
$16x^2+24x+36$
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