Math Chapter Wise Length Of Curve, Surface Area And Volume Of Solids Of Revolution English MCQ OPSC PGT 2017 Q.What is the length of an arc of the curve y = 1– In (cos x) intercepted between x = 0 and x = π/4 AIn(2 1) BIn(2 2) C1 in 2 DNone of these Show answer Correct answer: In(2 1)