$\lim_{x\to0}\sqrt{\frac{1+x-\sqrt{1-x}}{x}}$
$\left(\frac{1}{4}a^2-\frac{2}{3}b^3\right)\left(\frac{1}{4}a^2+\frac{2}{3}b^3\right)$
$\:\left(-\:\frac{4}{3}x+4\right)^2$
$\sqrt{12+2+4}$
$-3\left(25-21\right)\:$
$-2\:\left(\:10+\:\left(-8\right)\:\right)$
$\sqrt{\left(9x^4+6x^2+1\right)}$
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