(21) Let y be a function of r. Find y'(r) . Leave your answers unsimplified. (a) y = arcsin(arctan(2anz)), a ER (b) y = (VI) psec : + coser (c) y = I 2-1 (22) Find the derivative of f(2) = V z+1 Leave your answer unsimplified. (23) A right triangle with a hypotenuse of 6 inches is rotated about one of its legs to generate a right circular cone. What is the height of the greatest possible volume of this cone? (24) Evaluate the integral: Visin(1 + 23/2)dr