A) \[\sqrt{2ab}\]
B) \[{{\cos }^{-1}}\{\cos 2{{\cot }^{-1}}(\sqrt{2}-1)\}\]
C) \[\sqrt{2}-1\]
D) \[\frac{\pi }{4}\]
Correct Answer: A
Solution :
\[{{C}_{1}}=2\mu F\] \[{{R}_{2}}=2\Omega \]\[{{C}_{2}}=4\mu F\]
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