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Tentukan himpunan penyelesaian tiap persamaan berikut untuk 0∘≤x≤360∘. d. 2 sin (x+15∘) cos (x−15∘)=1

Pertanyaan

Tentukan himpunan penyelesaian tiap persamaan berikut untuk 0 degree less or equal than x less or equal than 360 degree.

d. 2 space sin space left parenthesis x plus 15 degree right parenthesis space cos space left parenthesis x minus 15 degree right parenthesis equals 1 

S. Yoga

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

Jawaban terverifikasi

Jawaban

 himpunan penyelesaiannya adalah HP equals left curly bracket 15 degree comma space 75 degree comma space 135 degree comma space 315 degree right curly bracket.

Pembahasan

Mencari himpunan penyelesaian:

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 sin open parentheses x plus 15 degree close parentheses cos open parentheses x minus 15 degree close parentheses end cell equals 1 row cell sin open parentheses x plus 15 degree close parentheses cos open parentheses x minus 15 degree close parentheses end cell equals cell 1 half end cell end table  
table attributes columnalign right center left columnspacing 0px end attributes row blank rightwards arrow cell sin open parentheses x plus 15 degree close parentheses equals 1 half end cell row blank rightwards arrow cell x plus 15 degree equals 30 degree plus 360 degree n end cell row x equals cell 360 degree n plus 15 degree end cell row blank rightwards arrow cell thin space x plus 15 degree equals 150 degree plus 360 degree n end cell row x equals cell 360 degree n plus 135 degree end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row blank rightwards arrow cell cos open parentheses x minus 15 degree close parentheses equals 1 half end cell row blank rightwards arrow cell x minus 15 degree equals 60 degree plus 360 degree n end cell row x equals cell 360 degree n plus 75 degree end cell row blank blank blank row blank rightwards arrow cell x minus 15 degree equals 300 degree plus 360 degree n end cell row x equals cell 360 degree n plus 315 degree end cell end table 

Himpunan penyelesaian yang memenuhi 0 degree less or equal than x less or equal than 360 degree adalah sebagai berikut:

table attributes columnalign center left center end attributes row blank cell x equals 360 degree n plus 15 degree end cell blank row cell x equals 0 rightwards arrow end cell cell x equals 15 degree end cell blank row blank cell x equals 360 degree n plus 135 degree end cell blank row cell x equals 0 rightwards arrow end cell cell x equals 135 degree end cell blank row blank cell x equals 360 degree n plus 75 degree end cell blank row cell x equals 0 rightwards arrow end cell cell x equals 75 degree end cell blank row blank cell x equals 360 degree n plus 315 degree end cell blank row cell x equals 0 rightwards arrow end cell cell x equals 315 degree end cell blank end table  

Jadi, himpunan penyelesaiannya adalah HP equals left curly bracket 15 degree comma space 75 degree comma space 135 degree comma space 315 degree right curly bracket.

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