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Pertanyaan

Selesaikanlah persamaan berikut untuk x ∈ R . sin 3 x ∘ = sin x ∘

Selesaikanlah persamaan berikut untuk .

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Z. Apriani

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

Jawaban terverifikasi

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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 sin space 3 x degree end cell equals cell sin space x degree end cell row cell sin space 3 x degree minus sin space x degree end cell equals 0 row cell 2 sin open parentheses fraction numerator 3 x plus x over denominator 2 end fraction close parentheses times cos open parentheses fraction numerator 3 x minus x over denominator 2 end fraction close parentheses end cell equals 0 row cell 2 sin space 2 x times cos space x end cell equals 0 row cell 2 times 2 sin space x times cos space x times cos space x end cell equals 0 row cell 4 sin space x times cos squared x end cell equals 0 row cell sin space x times cos squared x end cell equals 0 end table

Sehingga,

table attributes columnalign right center left columnspacing 0px end attributes row cell sin space x end cell equals cell 0 degree end cell row cell x subscript 1 end cell equals cell 0 degree plus n times 360 degree end cell row cell x subscript 2 end cell equals cell open parentheses 180 degree minus 0 degree close parentheses plus n times 360 degree end cell row n equals cell 0 comma space 1 end cell row cell x subscript 1 end cell equals cell 0 degree plus 0 times 360 degree end cell row blank equals cell 0 degree end cell row cell x subscript 1 end cell equals cell 0 degree plus 1 times 360 degree end cell row blank equals cell 360 degree end cell row cell x subscript 2 end cell equals cell open parentheses 180 degree minus 0 degree close parentheses plus 0 times 360 degree end cell row blank equals cell 180 degree end cell row cell x subscript 2 end cell equals cell open parentheses 180 degree minus 0 degree close parentheses plus 1 times 360 degree end cell row blank equals cell 540 degree end cell end table

atau

table attributes columnalign right center left columnspacing 0px end attributes row cell cos squared x end cell equals 0 row cell cos space x times cos space x end cell equals 0 row cell cos space x end cell equals cell 0 space atau space cos space x equals 0 end cell row cell cos space x end cell equals cell cos space 90 degree end cell row cell x subscript 1 end cell equals cell 90 degree plus n times 360 degree end cell row cell x subscript 2 end cell equals cell negative 90 degree plus n times 360 degree end cell row n equals cell 0 comma space 1 end cell row cell x subscript 1 end cell equals cell 90 degree plus 0 times 360 degree end cell row blank equals cell 90 degree end cell row cell x subscript 1 end cell equals cell 90 degree plus 1 times 360 degree end cell row blank equals cell 450 degree end cell row cell x subscript 2 end cell equals cell negative 90 degree plus 0 times 360 degree end cell row blank equals cell negative 90 degree end cell row cell x subscript 2 end cell equals cell negative 90 degree plus 1 times 360 degree end cell row blank equals cell 270 degree end cell end table

Dengan demikian,

HP equals open curly brackets 0 degree comma space 90 degree comma space 180 degree comma space 270 degree comma space 360 degree close curly brackets

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