Iklan

Pertanyaan

Diketahui x − y = 3 4 π ​ dan − 2 π ​ < x < 0 .Jika tan x = tan ( π − y ) , maka nilai dari sin ( 2 x − y ) adalah ....

Diketahui  dan . Jika , maka nilai dari  adalah ....

  1. begin mathsize 14px style negative 1 half square root of 3 end style 

  2. size 14px minus size 14px 1 over size 14px 2 

  3. begin mathsize 14px style 0 end style 

  4. size 14px 1 over size 14px 2 

  5. begin mathsize 14px style 1 half square root of 3 end style 

Ikuti Tryout SNBT & Menangkan E-Wallet 100rb

Habis dalam

01

:

04

:

03

:

29

Klaim

Iklan

M. Robo

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

Pembahasan

Perhatikan bahwa Sehingga Karena tan ⁡x = − tan ⁡y, maka Karena maka x berada di kuadran IV. Sehingga tan⁡x bernilai negatif. Maka . Pada interval tersebut, nilai x yang memenuhi persamaan adalah . Sehingga Maka Jadi, jawaban yang tepat adalah C.

Perhatikan bahwa

begin mathsize 14px style tan invisible function application x equals tan invisible function application open parentheses pi minus y close parentheses tan invisible function application x equals negative tan invisible function application y end style 

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell tan invisible function application open parentheses x minus y close parentheses end cell equals cell tan invisible function application open parentheses fraction numerator 4 pi over denominator 3 end fraction close parentheses end cell row cell fraction numerator tan invisible function application x minus tan invisible function application y over denominator 1 plus tan invisible function application x tan invisible function application y end fraction end cell equals cell tan invisible function application open parentheses fraction numerator 4 pi over denominator 3 end fraction close parentheses end cell end table end style 

Karena tan ⁡x = tan ⁡y, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator tan invisible function application x minus tan invisible function application y over denominator 1 plus tan invisible function application x tan invisible function application y end fraction end cell equals cell tan invisible function application open parentheses fraction numerator 4 pi over denominator 3 end fraction close parentheses end cell row cell fraction numerator tan invisible function application x minus open parentheses negative tan invisible function application x close parentheses over denominator 1 plus tan invisible function application x open parentheses negative tan invisible function application x close parentheses end fraction end cell equals cell square root of 3 end cell row cell fraction numerator tan invisible function application x plus tan invisible function application x over denominator 1 minus tan squared invisible function application x end fraction end cell equals cell square root of 3 end cell row cell fraction numerator 2 tan invisible function application x over denominator 1 minus tan squared invisible function application x end fraction end cell equals cell square root of 3 end cell row cell 2 tan invisible function application x end cell equals cell square root of 3 open parentheses 1 minus tan squared invisible function application x close parentheses end cell row cell 2 tan invisible function application x end cell equals cell square root of 3 minus square root of 3 tan squared invisible function application x end cell row cell square root of 3 tan squared invisible function application x plus 2 tan invisible function application x minus square root of 3 end cell equals 0 row cell open parentheses square root of 3 tan invisible function application x minus 1 close parentheses open parentheses tan invisible function application x plus square root of 3 close parentheses end cell equals 0 row cell tan invisible function application x end cell equals cell fraction numerator 1 over denominator square root of 3 end fraction text  atau  end text tan invisible function application x equals negative square root of 3 end cell end table end style 

Karena begin mathsize 14px style negative pi over 2 less than x less than 0 end style maka x berada di kuadran IV. Sehingga tan⁡x bernilai negatif. Maka begin mathsize 14px style tan invisible function application x equals negative square root of 3 end style.

Pada interval tersebut, nilai x yang memenuhi persamaan undefined adalah begin mathsize 14px style x equals negative pi over 3 end style.

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell x minus y end cell equals cell fraction numerator 4 pi over denominator 3 end fraction end cell row cell negative pi over 3 minus y end cell equals cell fraction numerator 4 pi over denominator 3 end fraction end cell row cell negative y end cell equals cell fraction numerator 4 pi over denominator 3 end fraction plus pi over 3 end cell row cell negative y end cell equals cell fraction numerator 5 pi over denominator 3 end fraction end cell row y equals cell negative fraction numerator 5 pi over denominator 3 end fraction end cell end table end style 

Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell sin invisible function application open parentheses 2 x minus y close parentheses end cell equals cell sin invisible function application open parentheses 2 open parentheses negative pi over 3 close parentheses minus open parentheses negative fraction numerator 5 pi over denominator 3 end fraction close parentheses close parentheses end cell row blank equals cell sin invisible function application open parentheses negative fraction numerator 2 pi over denominator 3 end fraction plus fraction numerator 5 pi over denominator 3 end fraction close parentheses end cell row blank equals cell sin invisible function application open parentheses fraction numerator 3 pi over denominator 3 end fraction close parentheses end cell row blank equals cell sin invisible function application pi end cell row blank equals 0 end table end style 

Jadi, jawaban yang tepat adalah C.

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

1

Iklan

Pertanyaan serupa

Diketahui x + y = 3 2 π ​ dan π < x < 2 3 π ​ .Jika tan x = tan ( π + y ) , maka nilai dari cos ( 2 1 ​ x + 2 y ) adalah ....

2

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