Answer :


We know cos 2x = 2cos2x – 1


Putting values in I we get,



Put cosx = t


Differentiating w.r.t to x we get,


sinx dx = -dt


Putting values in integral we get,



Again put √2× t = u


Differentiating w.r.t to t we get,



Putting values in integral we get,





Substituting value of u we get,



Substituting value of t we get,




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