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This was the first thing I did as soon as I saw the integral.. but not able to proceed... Still thinking.....
hint (2) .. make a substitution to turn the integral into the original one
Got it finally.. For some reason I was staring at this for a while longpic.twitter.com/ifv0S6J8nY
but the key point after this which results in the solution is that we try to convert it to the form of the original integral and try to kinnda find a linear eqn involving I
I had to look up all the trig identities but it's there!
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