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Jika maka

Jika tan space x space equals space 1 half comma maka space 2 space sin space x space plus space sin space open parentheses x plus straight pi over 2 close parentheses space cos space left parenthesis straight pi minus straight x right parenthesis space equals space...

  1. 1 half square root of 5

  2. 1

  3. 2 over 5 square root of 5

  4. 0

  5. negative 1 fifth square root of 5

Jawaban:

tan space x equals 1 half  sin space x equals 1 fifth square root of 5  cos space x equals 2 over 5 square root of 5  2 space sin space x plus sin space open parentheses x plus 1 half straight pi close parentheses plus cos open parentheses straight pi minus straight x close parentheses  equals 2 open parentheses 1 fifth square root of 5 close parentheses plus open parentheses sin space x space cos space 1 half straight pi plus cos space straight x space sin space 1 half straight pi close parentheses  plus open parentheses cos space straight pi space cos space straight x space plus space sin space straight pi space sin space straight x close parentheses  equals 2 over 5 square root of 5 plus left parenthesis 0 plus cos space x right parenthesis plus left parenthesis negative cos space x plus 0 right parenthesis  equals 2 over 5 square root of 5

0

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