`{:("खण्ड 'अ'","खण्ड 'ब'"),("1. "int(dx)/(x^(2)+a^(2)),"(a) "log[x-sqrt(x^(2)-a^(2))]),("2. "int(dx)/(sqrt(A^(2)-x^(2))),"(b) "(1)/(2)xsqrt(a^(2)-x^(2))+(1)/(2)a^(2)sin^(-1).(x)/(a)),("3. "intsqrt(a^(2)-x^(2))dx,"(c) "(1)/(a)tan^(-1)((x)/(a))),("4. "int(dx)/(sqrt(x^(2)-a^(2))),"(d) "a.tan^(-1)x),("5. "intsqrt(a^(2)+x^(2))dx,"(e) "sin^(-1)((x)/(a))),(,"(f) "(x)/(2)sqrt(A^(2)+x^(2))+(a^(2))/(2)log[x+sqrt(a^(2)+x^(2))]),(,"(g) "[x+sqrt(x^(2)-a^(2))].):}`

Answer

1. (c), 2. (e), 3. (b), 4. (g), 5. (f).