If f(x) is an identity function, then f(5) is equal to

If f(x) is a signum function, then f(10) is equal to

If f(x) is a signum function, then f(10) is equal to

Let f be a function satisfying f(x+y)=f(x)+f(y) and f(x)=x^3phi(x) for all x and y when phi (x) is a continuous function then f''(x) is equal to

Let f and g be differentiable functions satisfying g(a) = b,g' (a) = 2 and fog =I (identity function). then f' (b) is equal to

Let f and g be differentiable functions satisfying g(a) = b,g' (a) = 2 and fog =I (identity function). then f' (b) is equal to

Let f and g be differentiable functions satisfying g(a) = b,g' (a) = 2 and fog =I (identity function). then f' (b) is equal to

Let f and g be differentiable functions satisfying g(a) = b,g' (a) = 2 and fog =I (identity function). then f' (b) is equal to

If f and g are differentiable functions such that g^(')(a) =2 and g(a) = b and if fog is an identity function then f^(')(b) has the value equal 'to