Pertanyaan

cos 12 π + cos 12 5 π = ....

$cos \frac{π}{12} + cos \frac{5 π}{12} = ....$

D. Kamilia

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

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$begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell cos invisible function application straight pi over 12 plus cos invisible function application fraction numerator 5 straight pi over denominator 12 end fraction end cell equals cell 2 space cos invisible function application open parentheses fraction numerator begin display style straight pi over 12 end style plus begin display style fraction numerator 5 straight pi over denominator 12 end fraction end style over denominator 2 end fraction close parentheses space space cos invisible function application open parentheses fraction numerator begin display style straight pi over 12 minus fraction numerator 5 straight pi over denominator 12 end fraction end style over denominator 2 end fraction close parentheses end cell row blank equals cell 2 space cos invisible function application open parentheses fraction numerator begin display style fraction numerator 6 straight pi over denominator 12 end fraction end style over denominator 2 end fraction close parentheses space space cos invisible function application open parentheses fraction numerator begin display style negative fraction numerator 4 straight pi over denominator 12 end fraction end style over denominator 2 end fraction close parentheses end cell row blank equals cell 2 space cos invisible function application open parentheses fraction numerator begin display style 6 straight pi end style over denominator 24 end fraction close parentheses space space cos invisible function application open parentheses negative fraction numerator begin display style 4 straight pi end style over denominator 24 end fraction close parentheses end cell row blank equals cell 2 space cos invisible function application open parentheses fraction numerator begin display style straight pi end style over denominator 4 end fraction close parentheses space space cos invisible function application open parentheses negative fraction numerator begin display style straight pi end style over denominator 6 end fraction close parentheses rightwards arrow cos invisible function application left parenthesis negative straight x right parenthesis equals cos invisible function application straight x end cell row blank equals cell 2 space cos invisible function application open parentheses fraction numerator begin display style straight pi end style over denominator 4 end fraction close parentheses space space cos invisible function application open parentheses fraction numerator begin display style straight pi end style over denominator 6 end fraction close parentheses end cell row blank equals cell 2 open parentheses 1 half square root of 2 close parentheses open parentheses 1 half square root of 3 close parentheses end cell row blank equals cell 1 half square root of 6 end cell end table end style$

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