How the circled one came from t prior step?? I hope you will ans quickly and crctly without blabbering sth.. Im waiting ..
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In the prior step, it is given that
√4a^2 + 4a^2
=√8a^2
On factorizing,
√2×2×2×a×a
=2a√2
This is what, given in the next step.
Hope it helps you....(^_^)
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