The answer is not choice 7.

Which one of the following integrals gives 1. V5 + 4 cos O do T /2 the arc length of the portion shown as solid CT /2 blue in the graph 2. (1 + 2 cos 0) 2 do 3. (1 + 2 cos 0)2 de JT / 2 V5 + 4 cos 0 de 5. 2 (1+2 cos 0)? de (1 + 2 cos 0)2 de of the polar curve V5 + 4 cos 0 do r = 1+2cos0 . 8. V5 + 4 cos 0 de T / 2