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Pertanyaan

cos 10° ( cos 140° - cos 120° + cos 100°) = ....

cos 10°(cos 140° - cos 120° + cos 100°) = .... 

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

  2. begin mathsize 14px style negative sign 1 fourth square root of 3 end style 

  3. begin mathsize 14px style negative sign 1 fourth square root of 2 end style 

  4. begin mathsize 14px style negative sign 1 fourth end style 

  5. begin mathsize 14px style negative sign 3 over 4 end style 

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A. Abdul

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah B.

jawaban yang tepat adalah B.

Pembahasan

Ingat bahwa Sehingga Perhatikan bahwa Sehingga Jadi, jawaban yang tepat adalah B.

Ingat bahwa

begin mathsize 14px style cos invisible function application αcos invisible function application straight beta equals 1 half open parentheses cos invisible function application left parenthesis straight alpha plus straight beta right parenthesis plus cos invisible function application left parenthesis straight alpha minus straight beta right parenthesis close parentheses end style 
 

Sehingga

begin mathsize 14px style cos invisible function application 10 degree open parentheses cos invisible function application 140 degree minus sign cos invisible function application 120 degree plus cos invisible function application 100 degree close parentheses equals cos invisible function application 10 degree cos invisible function application 140 degree minus sign cos invisible function application 10 degree cos invisible function application 120 degree plus cos invisible function application 10 degree cos invisible function application 100 degree equals cos invisible function application 140 degree cos invisible function application 10 degree minus sign cos invisible function application 120 degree cos invisible function application 10 degree plus cos invisible function application 100 degree cos invisible function application 10 degree end style  
 

Perhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell cos invisible function application 140 degree cos invisible function application 10 degree end cell equals cell 1 half open parentheses cos invisible function application open parentheses 140 degree plus 10 degree close parentheses plus cos invisible function application open parentheses 140 degree minus sign 10 degree close parentheses close parentheses end cell row blank equals cell 1 half open parentheses cos invisible function application 150 degree plus cos invisible function application 130 degree close parentheses end cell end table end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell cos invisible function application 120 degree cos invisible function application 10 degree end cell equals cell 1 half open parentheses cos invisible function application open parentheses 120 degree plus 10 degree close parentheses plus cos invisible function application open parentheses 120 degree minus sign 10 degree close parentheses close parentheses end cell row blank equals cell 1 half open parentheses cos invisible function application 130 degree plus cos invisible function application 110 degree close parentheses end cell end table end style  


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell cos invisible function application 100 degree cos invisible function application 10 degree end cell equals cell 1 half open parentheses cos invisible function application open parentheses 100 degree plus 10 degree close parentheses plus cos invisible function application open parentheses 100 degree minus sign 10 degree close parentheses close parentheses end cell row blank equals cell 1 half open parentheses cos invisible function application 110 degree plus cos invisible function application 90 degree close parentheses end cell end table end style 
 

Sehingga

begin mathsize 14px style cos invisible function application 140 degree cos invisible function application 10 degree minus sign cos invisible function application 120 degree cos invisible function application 10 degree plus cos invisible function application 100 degree cos invisible function application 10 degree equals 1 half open parentheses cos invisible function application 150 degree plus cos invisible function application 130 degree close parentheses minus sign 1 half open parentheses cos invisible function application 130 degree plus cos invisible function application 110 degree close parentheses plus 1 half open parentheses cos invisible function application 110 degree plus cos invisible function application 90 degree close parentheses equals 1 half open parentheses cos invisible function application 150 degree plus cos invisible function application 90 degree close parentheses equals 1 half open parentheses negative sign 1 half square root of 3 plus 0 close parentheses equals minus sign 1 fourth square root of 3 end style 

Jadi, jawaban yang tepat adalah B.

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