Consider the function $$f(x) = \left\{ {\matrix{ {{{\sin 2x} \over {5x}},} & {if\,x \ne 0} \cr {{2 \over {15}},} & {if\,x = 0} \cr } } \right.$$

Which one of the following is correct in respect of the function?

For the function f(x) = | x $$-$$ 3 |, which one of the following is not correct?

If the function $$f(x) = {{2x - {{\sin }^{ - 1}}x} \over {2x + {{\tan }^{ - 1}}x}}$$ is continuous at each point in its domain then what is the value of f(0) ?

If $$f(x) = \sqrt {25 - {x^2}} $$, then what is $$\mathop {\lim }\limits_{x \to 1} {{f(x) - f(1)} \over {x - 1}}$$ equal to ?