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Pertanyaan

Himpunan penyelesaian persamaan cos 2 x − 2 cos x = − 1 untuk 0 ≤ x ≤ 2 π adalah . . .

Himpunan penyelesaian persamaan  untuk  adalah . . .

  1. open curly brackets 0 comma straight pi over 2 comma straight pi close curly brackets

  2. open curly brackets 0 comma straight pi over 2 comma fraction numerator 3 straight pi over denominator 2 end fraction close curly brackets

  3. open curly brackets 0 comma straight pi over 2 comma straight pi comma fraction numerator 3 straight pi over denominator 2 end fraction close curly brackets

  4. open curly brackets 0 comma straight pi over 2 comma fraction numerator 2 straight pi over denominator 3 end fraction comma 2 straight pi close curly brackets

  5. open curly brackets 0 comma straight pi over 2 comma fraction numerator 3 straight pi over denominator 2 end fraction comma 2 straight pi close curly brackets

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R. RGFLSATU

Master Teacher

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Kasus 1 Nilai sama dengan 0, jika berada pada sudut Kasus 2 Nilai sama dengan 1, jika berada pada sudut

cos space 2 x minus 2 space cos space x equals negative 1 open parentheses 2 space cos squared space x minus 1 close parentheses minus 2 space cos space x plus 1 equals 0 2 space cos squared space x minus 2 space cos squared space x equals 0 2 space cos squared space x open parentheses cos space x minus 1 close parentheses equals 0

Kasus 1 open parentheses 2 space cos space x equals 0 close parentheses

Nilai cos sama dengan 0, jika berada pada sudut 90 to the power of degree space dan space 270 to the power of degree

2 space cos space x equals 0 space left right double arrow space cos space x equals 0 space space space space cos space x equals cos space 90 to the power of degree space space space space space space space space space space space space space cos space x equals cos space 270 space space space space x equals 90 to the power of degree equals pi over 2 space space space space space space space space space space space space space space space space space space space space space space space space x equals 270 to the power of degree equals fraction numerator 3 pi over denominator 2 end fraction

Kasus 2 open parentheses cos space straight x minus 1 equals 0 space atau space cos space straight x equals 1 close parentheses

Nilai cos sama dengan 1, jika berada pada sudut 0 to the power of degree space dan space 360 to the power of degree

cos space x equals 0 space left right double arrow space cos space x equals 0 to the power of degree space space space space space space cos space x equals cos space 360 to the power of degree space space space space space x equals 0 to the power of degree equals 0 space space space space space space space space space space space space space space space space space space space space space space space space space x equals 360 to the power of degree equals 2 pi

therefore H P equals open curly brackets 0 comma pi over 2 comma fraction numerator 3 pi over denominator 2 end fraction comma 2 pi close curly brackets

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