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 tβ0
2 sin 2t
-- . ---------- =
t2 t2. tan t
b.
lim pβ0
β(1+cos 2p) - β2
-------------------- =
sin2p
c.
lim xβ0
sin(Ο/3) - sin (Ο/3 - x)
-------------------------- =
x
d.
lim xβ0
Ο/3 - (x + Ο/3) cos x
-------------------------- =
sin x
Jawaban :
a.
lim tβ0
2 sin 2t
-- . ---------- =
t2 t2. tan t
lim tβ0
2 sin 2t
-- . ---------- =
t4 tan t
lim tβ0
2
-- . 2 =
t4
lim tβ0
4
-- =
t4
4/0 = β
---------------------------------------------------------------------------------------------------------------------
b.
lim pβ0
β(1+cos 2p) - β2
-------------------- =
sin2p
lim pβ0
β(1+cos 2p) - β2 β(1+cos 2p) + β2
-------------------- . ----------------------- =
sin2p β(1+cos 2p) + β2
lim pβ0
1+cos 2p - 2 1
-------------------- . ----------------------- =
sin2p β(1+cos 2p) + β2
lim pβ0
cos 2p - 1 1
-------------------- . ----------------------- =
sin2p β(1+cos 2p) + β2
lim pβ0
- 2 . sin p . sin p 1
-------------------- . ----------------------- =
sin2p β(1+cos 2p) + β2
1
- 2 . -------------------- =
β(1+cos 0) + β2
-2
---------- =
β2 + β2
-2
------ =
2β2
-1 β2
----- . ---- = - 1/2 β2
β2 β2
---------------------------------------------------------------------------------------------------------------------
c.
lim xβ0
sin(Ο/3) - sin (Ο/3 - x)
-------------------------- =
x
turunan pertama
lim xβ0
0 + cos (Ο/3 - x)
---------------------- = cos (Ο/3) = 1/2
1
---------------------------------------------------------------------------------------------------------------------
d.
lim xβ0
Ο/3 - (x + Ο/3) cos x
-------------------------- =
sin x
lim xβ0
Ο/3 - x cos x + Ο/3 cos x
-------------------------- =
sin x
lim xβ0
Ο/3 + Ο/3 cos x - x cos x
-------------------------- =
sin x
lim xβ0
Ο/3 (1 - cos x) - x cos x
-------------------------- =
sin x
lim xβ0
Ο/3 . 2 . sin 1/2x . sin 1/2x - x cos x
------------------------------------------ =
sin x
lim xβ0
Ο/3 . 2 . 1/2 . sin 1/2x - x cos x / sin x =
turunan pertama untuk x cos x dan sin x
lim xβ0
Ο/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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