10. Which of the following integrals represents the area of the region that is the intersection of the circles sin 0 and r = cos 0 ? (a) CT/4 /41 T/2 1 ( cos 0) d0 + (sin 0) d0 COS - T/4 (b) T/4 1 T/2 (sin 0) do + 2 (cos 0)? do T/4 1 COS 2 | 0, (c) T/4 T/4 1 (cos 0)? de 1 (sin 0)? de - 2 (d) CT/4 T/4 1 ( sin 0) d0 (cos 0) do (e) 1 I (sin 0)? + (cos 0)]d