**·**2014-06-11 10:06:18

8) d;

9) c;

10)b;

11) b;

12) 3;

13) 1;

For 14) the general term in the denominator is 4r^{2} +3.on simplyfying the equation reduces to tan^{-1}(r+1/2) - tan^{-1}(r-1/2).Now after summing the term remaining is π/2 - tan^{-1}(1/2),which is also equal to π/4+π/4-tan^{-1}(1/2).now calculate by taking one π/4 as tan^{-1}(1).

·0·Reply·2013-06-07 22:43:24