[1-6]: Use the Product and Quotient Rules to find the derivative of each function. 1. f(x) = 3x cos x 4. f(x) = x+2 2x-7 2. y = 7x sin x 3x 5. y=x3-1 3. y = secx tan x x-4 6. f(x) = cotx [7-9]: Evaluate the derivative of each function at the indicated point. 7. f(x) = (x-3x) (2x + 3x + 5) sin x 8. f(x) = x 9. f(x) = tan x cotx