Soal dan Pembahasan USBN
SMA
Tahun 2018
Matematika IPA
Kunci Jawaban USBN Matematika IPA Tahun 2018
24. lim x → 0
cos 6x - 1
------------ = ...
1 - cos 2x
a. -13
b. -11
c. -9
d. -7
e. -5
Jawaban : C
lim x → 0
cos 6x - 1
------------ =
1 - cos 2x
lim x → 0
- (1 - cos 6x)
--------------- =
1 - cos 2x
oleh karena :
1 - 2 sin2 x = cos 2x
maka
1 - cos 2x = 2 sin2 x
dan
1 - cos 6x = 2 sin2 3x
lim x → 0
- (1 - cos 6x)
--------------- =
1 - cos 2x
lim x → 0
- (2 sin2 3x )
--------------- =
2 sin2 x
lim x → 0
- sin2 3x
--------------- =
sin2 x
lim x → 0
- sin 3x sin 3x
---------- . -------- =
sin x sin x
- 3 . 3 = - 9
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