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Jika diketahui cos(30 o + x) = 13 5 ​ ,maka nilai dari cos(75 o + x)adalah ....

Jika diketahui cos(30o + x) =  , maka nilai dari cos(75o + x) adalah ....

  1. begin mathsize 14px style negative 7 over 26 square root of 2 end style

  2. begin mathsize 14px style 7 over 26 square root of 2 end style

  3. begin mathsize 14px style negative 5 over 26 square root of 3 end style

  4. begin mathsize 14px style 5 over 26 square root of 3 end style

  5. begin mathsize 14px style 5 over 26 square root of 2 end style

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I. Roy

Master Teacher

Mahasiswa/Alumni Universitas Negeri Surabaya

Jawaban terverifikasi

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Pembahasan

Berdasarkan nilai cos(30 o + x), kita dapat membuat segitiga siku-siku sebagai berikut. Jadi

begin mathsize 14px style bold cos bold space bold alpha equals bold samping over bold miring end style

begin mathsize 14px style cos space left parenthesis 30 to the power of o plus straight x right parenthesis equals 5 over 13 end style

Berdasarkan nilai cos(30o + x), kita dapat membuat segitiga siku-siku sebagai berikut.

cos space left parenthesis 30 to the power of o plus x right parenthesis equals 5 over 13 space space semicolon space space space sin space left parenthesis 30 to the power of o plus x right parenthesis equals 12 over 13

Jadi 

begin mathsize 14px style cos space space open parentheses 75 to the power of o plus straight x close parentheses equals cos space open parentheses 45 to the power of o plus open parentheses 30 to the power of o plus straight x close parentheses close parentheses end style

begin mathsize 14px style equals cos space 45 to the power of o straight space. cos space open parentheses 30 to the power of o plus straight x close parentheses minus sin space open parentheses 45 to the power of o close parentheses. straight space sin space left parenthesis 30 to the power of o plus straight x right parenthesis equals open parentheses 1 half square root of 2 straight space close parentheses open parentheses 5 over 13 close parentheses minus open parentheses 1 half square root of 2 straight space close parentheses open parentheses 12 over 13 close parentheses equals 5 over 26 square root of 2 minus 12 over 26 square root of 2 equals negative 7 over 26 square root of 2   end style

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