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Tentukan himpunan penyelesaian dari persamaan berikut untuk 0 ∘ ≤ x ≤ 36 0 ∘ cos 2 x ∘ − 3 cos x ∘ + 2 = 0

Tentukan himpunan penyelesaian dari persamaan berikut untuk 

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N. Puspita

Master Teacher

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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 minus 3 cos space x degree plus 2 end cell equals 0 row cell open parentheses 2 cos squared x minus 1 close parentheses minus 3 cos space x degree plus 2 end cell equals 0 row cell 2 cos squared x minus 3 cos space x degree plus 1 end cell equals 0 row cell open parentheses 2 cos space x minus 1 close parentheses open parentheses cos space x minus 1 close parentheses end cell equals 0 row cell cos space x end cell equals cell 1 half space atau end cell row cell cos space x end cell equals 1 end table

Sehingga,

table attributes columnalign right center left columnspacing 0px end attributes row cell cos space x end cell equals cell 1 half end cell row cell cos space x end cell equals cell cos space 60 degree end cell row x equals cell 60 degree plus n times 360 degree end cell row n equals cell 0 comma space 1 end cell row x equals cell 60 degree plus 0 times 360 degree end cell row blank equals cell 60 degree end cell row x equals cell 60 degree plus 1 times 360 degree end cell row blank equals cell 420 degree end cell row blank blank atau row x equals cell negative 60 degree plus n times 360 degree end cell row n equals cell 0 comma space 1 end cell row x equals cell negative 60 degree plus 0 times 360 degree end cell row blank equals cell negative 60 degree end cell row x equals cell negative 60 degree plus 1 times 360 degree end cell row blank equals cell 300 degree end cell end table

atau

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

Dengan demikian, 

HP equals open curly brackets 0 degree comma space 60 degree comma space 300 degree comma space 360 degree close curly brackets

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