JEE Advance - Mathematics (1979 - No. 21)
Find the derivative of
$$$f\left( x \right) = \left\{ {\matrix{
{{{x - 1} \over {2{x^2} - 7x + 5}}} & {when\,\,x \ne 1} \cr
{ - {1 \over 3}} & {when\,\,x = 1} \cr
} } \right.$$$
at $$x=1$$
at $$x=1$$
-1/9
-2/9
1/9
2/9
0