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Tentukan himpunan penyelesaian dari persamaan berikut untuk

Tentukan himpunan penyelesaian dari persamaan berikut untuk negative 360 degree less or equal than x less or equal than 360 degree

cos space 2 x degree minus 3 sin x degree minus 1 equals 0

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N. Puspita

Master Teacher

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Dengan menggunakan rumus trigonometri, misalkan Sehingga, Dengan demikian,

Dengan menggunakan rumus trigonometri, misalkan sin space x equals y

table attributes columnalign right center left columnspacing 0px end attributes row cell cos space 2 x degree minus 3 sin x degree minus 1 end cell equals 0 row cell 1 minus 2 sin squared x degree minus 3 sin x degree minus 1 end cell equals 0 row cell negative 2 sin squared x degree minus 3 sin x degree end cell equals 0 row cell negative 2 y squared minus 3 y end cell equals 0 row cell 2 y squared plus 3 y end cell equals 0 row cell y left parenthesis 2 y plus 3 right parenthesis end cell equals 0 row y equals 0 row cell sin space x degree end cell equals cell 0 space atau end cell row cell 2 y plus 3 end cell equals 0 row cell 2 space sin space x degree plus 3 end cell equals 0 row cell 2 space sin space x degree end cell equals cell negative 3 end cell row cell sin space x degree end cell equals cell fraction numerator negative 3 over denominator 2 end fraction space left parenthesis tidak space ada space nilai space yang space memenuhi right parenthesis end cell end table

Sehingga,

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

Dengan demikian, 

HP equals open curly brackets negative 360 degree comma space minus 180 degree comma space 0 degree comma space 180 degree comma space 360 degree close curly brackets

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