Ordered Triples: Expansion & Simplification

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Expand the following down to their representations as sets and simplify.
i.) ⟨1, 2, 3⟩1 =
ii.) ⟨1, 2, 2⟩1 =


These are the definitions i have
Recall the defintion of ordered pairs:
⟨a, b⟩ def = {{a}, {a, b}}
Recall the following expansion and simplification from class
⟨a, a,⟩ = {{a}, {a, a}} = {{a}, {a}} = {{a}}
Using ordered pairs we could define ordered triples in two different ways:
⟨a, b, c⟩1 def = ⟨a, ⟨b, c⟩⟩
⟨a, b, c⟩2 def = ⟨⟨a, b⟩, c⟩
 
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So... you have the definitions - what's stopping you?
Just plug in the numbers!
 
Prove $$\int\limits_0^{\sqrt2/4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx = \frac{\pi^2}{8}.$$ Let $$I = \int\limits_0^{\sqrt 2 / 4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx. \tag{1}$$ The representation integral of ##\arcsin## is $$\arcsin u = \int\limits_{0}^{1} \frac{\mathrm dt}{\sqrt{1-t^2}}, \qquad 0 \leqslant u \leqslant 1.$$ Plugging identity above into ##(1)## with ##u...
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