Matematika Peminatan Sukino Kelas XII
Limit Fungsi Aljabar dan Fungsi Trigonometri
LKS 1
Soal dan Pembahasan Matematika Sukino Peminatan
Bagian B
4. Hitunglah setiap limit berikut.
a.
lim t→0
2 sin 2t
-- . ---------- =
t2 t2. tan t
b.
lim p→0
√(1+cos 2p) - √2
-------------------- =
sin2p
c.
lim x→0
sin(π/3) - sin (π/3 - x)
-------------------------- =
x
d.
lim x→0
π/3 - (x + π/3) cos x
-------------------------- =
sin x
Jawaban :
a.
lim t→0
2 sin 2t
-- . ---------- =
t2 t2. tan t
lim t→0
2 sin 2t
-- . ---------- =
t4 tan t
lim t→0
2
-- . 2 =
t4
lim t→0
4
-- =
t4
4/0 = ∞
---------------------------------------------------------------------------------------------------------------------
b.
lim p→0
√(1+cos 2p) - √2
-------------------- =
sin2p
lim p→0
√(1+cos 2p) - √2 √(1+cos 2p) + √2
-------------------- . ----------------------- =
sin2p √(1+cos 2p) + √2
lim p→0
1+cos 2p - 2 1
-------------------- . ----------------------- =
sin2p √(1+cos 2p) + √2
lim p→0
cos 2p - 1 1
-------------------- . ----------------------- =
sin2p √(1+cos 2p) + √2
lim p→0
- 2 . sin p . sin p 1
-------------------- . ----------------------- =
sin2p √(1+cos 2p) + √2
1
- 2 . -------------------- =
√(1+cos 0) + √2
-2
---------- =
√2 + √2
-2
------ =
2√2
-1 √2
----- . ---- = - 1/2 √2
√2 √2
---------------------------------------------------------------------------------------------------------------------
c.
lim x→0
sin(π/3) - sin (π/3 - x)
-------------------------- =
x
turunan pertama
lim x→0
0 + cos (π/3 - x)
---------------------- = cos (π/3) = 1/2
1
---------------------------------------------------------------------------------------------------------------------
d.
lim x→0
π/3 - (x + π/3) cos x
-------------------------- =
sin x
lim x→0
π/3 - x cos x + π/3 cos x
-------------------------- =
sin x
lim x→0
π/3 + π/3 cos x - x cos x
-------------------------- =
sin x
lim x→0
π/3 (1 - cos x) - x cos x
-------------------------- =
sin x
lim x→0
π/3 . 2 . sin 1/2x . sin 1/2x - x cos x
------------------------------------------ =
sin x
lim x→0
π/3 . 2 . 1/2 . sin 1/2x - x cos x / sin x =
turunan pertama untuk x cos x dan sin x
lim x→0
π/3 . sin 1/2x - (- x sin x + cos x) / cos x =
0 - ( 0 + 1) / 1 = -1
>> soal bag B no 5
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