Re: Maths

Posted by anon_econ on Dec 21, 2011; 2:07pm
URL: http://discussion-forum.276.s1.nabble.com/Maths-tp7111879p7115241.html

Thanks duck. But if f(x)=cos x, then f'(x)=-sinx and f'(-x)=sinx. So the initial condition is not satisfied according to me. If i take f(x)=sin x, then f(x)=f'(-x) but i can rule out only the 3rd option.
By the way the question had said that there could be 2 correct options as well..i forgot to mention it.