if f(x)=x3+x2f(1)+xf(2)+f(3). then f(2) is-

If $f(x)=\cosh x+\sinh x$ then $f(x_{1}+x_{2}+.......+x_{n})=$

Let $f(x)=\left | x-x_{1} \right |+\left | x-x_{2} \right |$ where $x_{1} and x_{2}$ are distinct  real numbers. Then the number of points at which f(x) is minimum is:

If $f(x + \frac 1 2) + f(x - \frac 1 2) = f(x)$,$\forall\  x\ \epsilon\  R$, then $f(x-3) + f(x + 3)$ is equal to 

If $x = (7 + 4\sqrt {3})^{2n} = [x] + f$, where $n \epsilon N$ and $0\leq f < 1$, then $x(1 - f)$ is equal to