Kako najdete derivat g (x) = 2 / (x + 1) z definicijo omejitve?

Kako najdete derivat g (x) = 2 / (x + 1) z definicijo omejitve?
Anonim

Odgovor:

# = 2 / (x + 1) ^ 2 #

Pojasnilo:

#f '(x) = lim_ (hrarr0) (f (x + h) -f (x)) / h #

# = lim_ (hrarr0) (-2 / (x + h + 1) + 2 / (x + 1)) / h #

# = lim_ (hrarr0) ((- 2 (x + 1)) / ((x + h + 1) (x + 1)) + (2 (x + h + 1)) / ((x + h + 1)) (x + 1)) / h #

# = lim_ (hrarr0) ((2h) / ((x + h + 1) (x + 1)) / h = lim_ (hrarr0) 2 / ((x + h + 1) (x + 1)) #

# = 2 / (x + 1) ^ 2 #