25. 17. 18. 19. 20. 21. 23. 24. 26. 22. - T/4 dx ') T dx 27. What is the. 9. What is the area enclosed by the curve 2x2 + y2 = 1? (a) 2π (b) π (c) 2 π (d) π 2 [2007-II] 10. 11. 12. 13. 14. 15. 16. What is the value of integral I= ...