Hello I need help in the following questions

FOR QUESTION 1 I NEED NUMBER B

show all the work and briefly explain your steps & reasoning (reason for doing the work you are showing).

I need the answers today as soon as possible thx :)

1. Differentiate & fully simplify the following functions:

b. ) f (x) = 3csc'(2x) sec' (3x)\f4.) Given f(x) = 4129'; a.) Determine the points at which x) has horizontal tangents algebraically. b.) Are there places on x) in which x) is net differentiable? Explain