soal trigonometri
 
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[Matematika] soal trigonometri

1. cos 18 = ...
2. cot 7,5 = ...
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Re: soal trigonometri

huwa......ntu mah bukan trigonometri..
drajat2an
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Re: soal trigonometri

1. cos 18 = cos 1 x 18
2. cot 7,5 = cos 1 x 7,5

Semoga beruntung..hihihihih
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Re: soal trigonometri

Ampun maakkkk... nggak ngerti aku <- dulu sekolah gak belajar beginian den
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Re: soal trigonometri

Kutip:
Oleh prasetyo2009 View Post
1. cos 18 = cos 1 x 18
2. cot 7,5 = cos 1 x 7,5

Semoga beruntung..hihihihih
ngawur cos 1 kan 0, 0 x 18 = 0

harus pake calculator
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Re: soal trigonometri





hehe bnr ga sih, ga tau dah lpa, tp mungkin aja bnr
math is really fun
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Re: soal trigonometri

Kutip:
Oleh frans_umila View Post
1. cos 18 = ...
2. cot 7,5 = ...
kalkulator
1. cos(18) = 0.660316708
2. cot 7.5 = 7.59575
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Bls: soal trigonometri

Kutip:
Oleh frans_umila View Post
1. cos 18 = ...
2. cot 7,5 = ...
cos 18 =sec 72

cot 7.5 =tan 82.5
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Bls: soal trigonometri

hal kek gini gak mungkin di afal pasti pk kalkulator
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Bls: soal trigonometri

paling mudah ya pake kalkulator!

tapi coba, ini agak seriyus ...

misalkan 18 (dalam derajat) = x

cos 5x = cos 5*18
cos 5x = cos 90
cos 5x = 0
uraikan ruas kiri
cos 5x = 0
cos(2x + 3x) = 0
... dan seterusnya, sampai berbentuk

16*(cos x)^5 -20*(cos x)^3 + 5*cos x = 0
faktorkan dan bagi kedua ruas dengan 16
cos x((cos x)^4 -20*(cos x)^2 + 5) = 0
kemungkinan2 nya
cos x = 0 (tidak mungkin) atau
16*(cos x)^4 -20*(cos x)^2 + 5 = 0
misal (cos x)^2 = y
16*y^2 - 20*y + 5 = 0
selesaikan pakai rumus akar persamaan kuadrat (rumus abc)
diperoleh
y = (5+sqrt(5))/8 atau y = (5-sqrt(5))/8
(cos x)^2 = (5+sqrt(5))/8 atau (cos x)^2 = (5-sqrt(5))/8
cos x = sqrt ((5+sqrt(5))/8) atau cos x = - ... atau cos x = ... atau cos x = ...
tinggal verifikasi mana yang cocok, kerena di antara sekian banyak kemungkinan jawab, hanya 1 yang memenuhi.

soal satunya tingal memisalkan 7,5 = x
trus caranya mirip seperti di atas.
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