Vector Problem | Need Help with Problems 3 and 4? Get Expert Assistance Here!

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Attached is the problem I need help on. I have done 1 and 2 but I am not sure how to do 3 and 4. Any help will be appreciated.

This is what I have so far, are the answers correct?
 

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While we are all awaiting for the attachment to be approved, you should show some attempt toward solving 3 and 4.
 
i just attaced them
 
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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