Câu trả lời:
#f '(x) = (- 4e ^ (4x) csc ^ 2 (e ^ (4x)) (cũi (e ^ (4x))) ^ (- 1/2)) / 2 #
#color (trắng) (f '(x)) = - (2e ^ (4x) csc ^ 2 (e ^ (4x))) / sqrt (cot (e ^ (4x)) #
Giải trình:
#f (x) = sqrt (cũi (e ^ (4x))) #
#color (trắng) (f (x)) = sqrt (g (x)) #
#f '(x) = 1/2 * (g (x)) ^ (- 1/2) * g' (x) #
#color (trắng) (f '(x)) = (g' (x) (g (x)) ^ (- 1/2)) / 2 #
#g (x) = cũi (e ^ (4x)) #
#color (trắng) (g (x)) = cot (h (x)) #
#g '(x) = - h' (x) csc ^ 2 (h (x)) #
#h (x) = e ^ (4x) #
#color (trắng) (h (x)) = e ^ (j (x)) #
#h '(x) = j' (x) e ^ (j (x)) #
#j (x) = 4x #
#j '(x) = 4 #
#h '(x) = 4e ^ (4x) #
#g '(x) = - 4e ^ (4x) csc ^ 2 (e ^ (4x)) #
#f '(x) = (- 4e ^ (4x) csc ^ 2 (e ^ (4x)) (cũi (e ^ (4x))) ^ (- 1/2)) / 2 #
#color (trắng) (f '(x)) = - (2e ^ (4x) csc ^ 2 (e ^ (4x))) / sqrt (cot (e ^ (4x)) #