If f(x) = sin(x), the derivative of f(log(x)) w.r.t. x is
cos(x)
f'(log(x))
cos(log(x))
D.
If f(x + y) = 2 f(x) f(y), f'(5) = 1024log(2) and f(2) = 8, then the value of f'(3) is
64(log(2))
128(log(2))
256
256log(2)
Gas is being pumped into a spherical balloon at the rate of 30 ft3/min. Then, the rate at which the radius increases when it reaches the value 15 ft is