Kelas XII
Sukino Kelas XII
Kunci Jawaban Matematika Kelas XII Peminatan
Bab 2 Turunan Fungsi Trigonometri
RUKO 2
Bag A
29. Jika f(2) = 3, f ' (2) = 6, g(2) = 1 , g ' (2) = 4, dan h(x) = (f(x) . g(x)) / (f(x) - g(x)) , maka h'(2) = ...
a. 15/4
b. 6
c. 15/2
d. 9
e. 12
Jawaban : C
h(x) = (f(x) . g(x)) / (f(x) - g(x))
u = f(x) . g(x)
u ' = f '(x) . g(x) + f (x) . g' (x)
v = f(x) - g(x)
v ' = f '(x) - g ' (x)
h(x) = u/v
u ' . v - v' . u
h' (x) = -----------------
v2
f '(x) . g(x) + f (x) . g' (x) . (f(x) - g(x)) - (f '(x) - g ' (x)) . f(x) . g(x)
h' (x) = ---------------------------------------------------------------------------------
(f(x) - g(x))2
f '(2) . g(2) + f (2) . g' (2) . (f(2) - g(2)) - (f '(2) - g ' (2)) . f(2) . g(2)
h' (2) = ---------------------------------------------------------------------------------
(f(2) - g(2))2
f(2) = 3, f ' (2) = 6, g(2) = 1 , g ' (2) = 4
(6 . 1 + 3 . 4) . (3 - 1) - (6 - 4) . 3 . 1
h' (2) = ------------------------------------------
(3 - 1)2
(6 + 12) . (2) - (2) . 3
h' (2) = ---------------------------
(2)2
18 . (2) - 6
h' (2) = --------------
4
h' (2) = (36 - 6) / 4
h' (2) = 30/4 = 15/2
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