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Pertanyaan

Jika 2 cos ( x + 4 π ​ ) = cos ( x − 4 π ​ ) , maka....

Jika , maka....

  1. tan space x equals 1 third

  2. sin space x equals fraction numerator square root of 2 over denominator 2 end fraction

  3. cos space x equals fraction numerator square root of 2 over denominator 3 end fraction

  4. tan space x

  5. sin space x equals 1 half

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K. Putri

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Ganesha

Jawaban terverifikasi

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Pembahasan

2 space cos space open parentheses x plus straight pi over 4 close parentheses equals cos open parentheses x minus straight pi over 4 close parentheses  cos left parenthesis A minus B right parenthesis equals cos space A space cos space B plus sin space A space sin space B  cos left parenthesis A plus B right parenthesis equals cos space A space cos space B minus sin space A space sin space B  2 space cos space open parentheses x plus straight pi over 4 close parentheses equals cos open parentheses x minus straight pi over 4 close parentheses  2 space cos space x space cos space straight pi over 4 minus 2 space sin space x space sin space straight pi over 4  equals cos space x space cos straight pi over 4 plus sin space x space sin space straight pi over 4  J i k a comma space cos straight pi over 4 equals sin straight pi over 4 comma space m a k a space colon  2 space cos space x space cos space straight pi over 4 minus 2 space sin space x space sin space straight pi over 4  equals cos space x space cos space straight pi over 4 plus sin space x space sin straight pi over 4  2 space left parenthesis cos space x minus sin space x right parenthesis equals cos space x space plus space sin space x  2 space cos space x space minus space 2 space sin space x equals cos space x space plus space sin space x  cos space x equals 3 space sin space x  fraction numerator sin space x over denominator cos space x end fraction equals 1 third  tan space x equals 1 third

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