`{:("खण्ड 'अ'","खण्ड 'ब'"),("1. "inttanxdx,"(a) "(1)/(2a)log.(x-a)/(x+a)", "xgta),("2. "intcotxdx,"(b) "(1)/(2a)log(a+x)/(a-x)", "xlta),("3. "intsecxdx,"(c) "logsinx),("4. "int(1)/(x^(2)-a^(2))dx,"(d) "-logcosx),("5. "int(1)/(a^(2)-x^(2))dx,"(e) "log(secx+tanx)):}`

Answer

1. (d), 2. (c), 3. (e), 4.(a), 5. (b).