$\lim_{x\to0}x\left(1-cosx\right)$
$\frac{12}{11x+2}<8$
$\left(\cos\left(\frac{x}{2}\right)\right)^2=\frac{1}{2}$
$4-x^6-x^6-x^9$
$-81=x+5$
$\left(\left(t\cdot\left(1-t^2\right)^{-0.5}\right)^2+1\right)^{0.5}$
$3\left(a+b\right)+x\left(a+c\right)$
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