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1. Still didn't get it.

2. It's root t MINUS 1/root t, not plus.

a^2 = (root t)^2
b^2= (1/root t)^2
2ab = 2 X (root t) X (1/root t) = 2
So, it's (root t +1/root t)^2
BTW, can you explain me how the 2nd term changed in first step?

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