Iklan

Pertanyaan

Tentukan himpunan penyelesaian dari persamaan berikut untuk − 36 0 ∘ ≤ x ≤ 36 0 ∘ cos 2 x ∘ + cos x ∘ − 2 cos 2 x ∘ = 0

Tentukan himpunan penyelesaian dari persamaan berikut untuk 

Ikuti Tryout SNBT & Menangkan E-Wallet 100rb

Habis dalam

02

:

00

:

56

:

28

Klaim

Iklan

Z. Apriani

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

Jawaban terverifikasi

Pembahasan

Dengan menggunakan rumus trigonometri, diperoleh: Sehingga, atau Dengan demikian,

Dengan menggunakan rumus trigonometri, diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row cell cos space 2 x degree plus cos space x degree minus 2 cos space 2 x degree end cell equals 0 row cell cos space x degree minus cos space 2 x degree end cell equals 0 row cell cos space x degree minus open parentheses 2 space cos squared x degree minus 1 close parentheses end cell equals 0 row cell 2 space cos squared x degree minus cos space x degree minus 1 end cell equals 0 row cell open parentheses 2 cos space x degree plus 1 close parentheses left parenthesis cos space x degree minus 1 right parenthesis end cell equals 0 row cell 2 cos space x degree plus 1 end cell equals 0 row cell cos space x degree end cell equals cell negative 1 half space atau end cell row cell cos space x degree minus 1 end cell equals 0 row cell cos space x degree end cell equals 1 end table

Sehingga,

table attributes columnalign right center left columnspacing 0px end attributes row cell cos space x degree end cell equals cell negative 1 half end cell row cell cos space x degree end cell equals cell cos space 120 degree end cell row cell x degree end cell equals cell 120 degree plus n times 360 degree end cell row n equals cell 0 comma space 1 end cell row cell x degree end cell equals cell 120 degree plus 0 times 360 degree end cell row blank equals cell 120 degree end cell row cell x degree end cell equals cell 120 degree plus 1 times 360 degree end cell row blank equals cell 480 degree end cell row blank blank atau row cell x degree end cell equals cell negative 120 degree plus n times 360 degree end cell row n equals cell 0 comma space 1 end cell row cell x degree end cell equals cell negative 120 degree plus 0 times 360 degree end cell row blank equals cell negative 120 degree end cell row cell x degree end cell equals cell negative 120 degree plus 1 times 360 degree end cell row blank equals cell 240 degree end cell row cell cos space x degree end cell equals cell cos space open parentheses negative x degree close parentheses end cell row cell cos space x degree end cell equals cell cos space open parentheses negative 120 degree close parentheses end cell row cell x degree end cell equals cell negative 120 degree end cell row cell cos space x degree end cell equals cell cos space open parentheses negative 240 degree close parentheses end cell row cell x degree end cell equals cell negative 240 degree end cell end table

atau

table attributes columnalign right center left columnspacing 0px end attributes row cell cos space x degree end cell equals 1 row cell cos space x degree end cell equals cell cos space 0 degree end cell row cell x degree end cell equals cell 0 degree plus n times 360 degree end cell row n equals cell 0 comma space 1 end cell row cell x degree end cell equals cell 0 degree plus 0 times 360 degree end cell row blank equals cell 0 degree end cell row cell x degree end cell equals cell 0 degree plus 1 times 360 degree end cell row blank equals cell 36 0 degree end cell row cell cos space x degree end cell equals cell cos space open parentheses negative x degree close parentheses end cell row cell cos space x degree end cell equals cell cos space open parentheses negative 360 degree close parentheses end cell row cell x degree end cell equals cell negative 360 degree end cell end table

Dengan demikian,

HP equals open curly brackets negative 360 degree comma space minus 240 degree comma space minus 120 degree comma space 0 degree comma space 120 degree comma space 240 degree comma space 360 degree close curly brackets

Perdalam pemahamanmu bersama Master Teacher
di sesi Live Teaching, GRATIS!

64

Iklan

Pertanyaan serupa

Tentukan himpunan penyelesaian dari persamaan-persamaan trigonometri berikut! b. cos 4 x = cos 10 0 ∘ , 0 ∘ ≤ x ≤ 36 0 ∘

3

5.0

Jawaban terverifikasi

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Roboguru

Coba GRATIS Aplikasi Ruangguru

Download di Google PlayDownload di AppstoreDownload di App Gallery

Produk Ruangguru

Hubungi Kami

Ruangguru WhatsApp

+62 815-7441-0000

Email info@ruangguru.com

[email protected]

Contact 02140008000

02140008000

Ikuti Kami

©2024 Ruangguru. All Rights Reserved PT. Ruang Raya Indonesia