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10. Which of the following is the maximum value of the function f(x) = 2 sinx cos x? a. 0 c. 2 b. 1 d. There does not exist a maximum value. 11. Determine the derivative dy dx for y = 10 tan(2x + 9). a. = 10 sec(2x + 9) c. dy = 20 tan(2x + 9) dx dx dy = (20x + 90) tan(2x + 9) d. dy - 20 sec (2x + 9) dx dx 12. Determine the derivative dy dx for y = tan x cos x. a. dy = -sin xtan x + cos xsec x c. dy = cos x sec x dx dx b. dy dy = -sin xtanx + cos xtan x = sin x - cos x sec x dx dx