Matematika Peminatan Sukino Kelas XII
Limit Fungsi Aljabar dan Fungsi Trigonometri
LKS 1
Soal dan Pembahasan Matematika Sukino Peminatan
Bagian B
3. Selesaikanlah setiap bentuk limit berikut.
a.
lim x→π/2
1 - sin2 x
------------ =
cos2x
b.
lim x→0
1 - cos2 x
----------------- =
x . sin x cos x
c.
lim θ→π/2 (sec θ - tan θ)
d,
lim x→0
(1 - cos 2x) sin 5x
----------------------- =
x2 . sin 3x
Jawaban :
a.
lim x→π/2
1 - sin2 x
------------ =
cos2x
1 - sin2 x = cos2 x
lim x→π/2
cos2x
------- = 1
cos2x
b.
lim x→0
1 - cos2 x
----------------- =
x . sin x cos x
1 - cos2 x = sin2 x
lim x→0
sin2 x
----------------- =
x . sin x cos x
lim x→0
sin x . sin x 1
-------------- . ------ =
x . sin x cos x
1 . 1 = 1
c.
lim θ→π/2 (sec θ - tan θ)
lim θ→π/2
1 sin θ
------ - ------- =
cos θ cos θ
lim θ→π/2
1-sin θ 1 + sin θ
--------- . ---------- =
cos θ 1 + sin θ
lim θ→π/2
1 - sin2 θ
-------------------- =
cos θ (1 + sin θ)
1 - sin2 x = cos2 x
lim θ→π/2
cos2 θ
-------------------- =
cos θ (1 + sin θ)
lim θ→π/2
cos θ
------------ =
(1 + sin θ)
0
------ = 0
1 + 1
d.
lim x→0
(1 - cos 2x) sin 5x
----------------------- =
x2 . sin 3x
lim x→0
2 sin x sin x sin 5x
----------------------- =
x2 . sin 3x
lim x→0
sin x sin x sin 5x
2 .------ ------- ---------- =
x x sin 3x
2 . 1 . 1 . 5/3 = 10/3
>> soal bag B no 4
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