Question

just looking for another answer to be checked!

Answer 1

Use the functions given below to determine the following.
f(u) = 3u^4 + 4u
g(x) = cos(x)

Answer 2

f (g(x)) =\[3\cos^4x+4cosx\]

f ' (u) = 12u^3+4

f ' (g(x)) = 12cos(x)^3+4

g'(x)=-sinx

(f compose g) '(x) =-12cos(x)^3*sin(x)-4*sin(x)

Answer 3

yes it's right

Answer 4

all of them? awesome! haha.