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Nilai dari cos 145° + cos 35° — cos 45° = ....

Nilai dari cos 145° + cos 35° — cos 45° = ....

  1. begin mathsize 14px style 1 half square root of 3 end style

  2. begin mathsize 14px style 1 half square root of 2 end style

  3. begin mathsize 14px style 1 half end style

  4. begin mathsize 14px style negative 1 half end style

  5. begin mathsize 14px style negative 1 half square root of 2 end style

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S. Intan

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

Jawaban terverifikasi

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Pembahasan

begin mathsize 14px style Ingat comma  cos invisible function application space straight A plus cos space invisible function application straight B equals 2 space cos space invisible function application 1 half open parentheses straight A plus straight B close parentheses space cos space invisible function application 1 half open parentheses straight A minus straight B close parentheses  Sehingga  cos invisible function application space 145 degree plus cos invisible function application space 35 degree equals 2 space cos invisible function application space 1 half open parentheses 145 degree plus 35 degree close parentheses space cos space invisible function application 1 half open parentheses 145 degree minus 35 degree close parentheses  equals 2 space cos invisible function application space 90 degree cos invisible function application space 55 degree  equals 0    Maka comma  cos invisible function application space 145 degree plus cos invisible function application space 35 degree minus cos space invisible function application 45 degree equals 0 minus cos space invisible function application 45 degree  rightwards double arrow 0 minus open parentheses 1 half square root of 2 close parentheses  rightwards double arrow negative 1 half square root of 2 end style

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