Solution
$$\frac{1}{\sqrt{17 + 12\sqrt{2}}}$$
= $$\frac{1}{\sqrt{17 + 12\times 1.414}}$$
= $$\frac{1}{\sqrt{17 + 16.97}}$$
= $$\frac{1}{\sqrt{34}}$$
= $$\frac{1}{6}$$ = 0.166 = 0.17(Approx)
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