11. Which of the following represents the length of the polar curve (4 Points) r = 0 - #,OSOS *? 1 +0 - do osa 1 + (0 - #)2do 14 1 - (0 - 7)2 do Of Oz + (0 - # )2 do 12. After the substitution u=sinh x, the integral (4 Points) S sinh x cosh' x dx is equal to : O Su- (1 - u2) du O S u2 (u2 - 1) du Of uz (1 + u2) du O Su (1 + u2) du9. The volume of the solid obtained by rotating the region bounded by the graph of (4 Points) y = In x and the line y = 0 for 1