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Tentukan nilai dari

Tentukan nilai dari begin mathsize 14px style cos open parentheses 390 degree close parentheses plus sec open parentheses 570 degree close parentheses end style  

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell cos left parenthesis open parentheses 2 straight pi plus 30 close parentheses degree right parenthesis plus sec left parenthesis open parentheses 2 straight pi plus 210 close parentheses degree right parenthesis end cell equals cell cos left parenthesis 30 degree right parenthesis plus sec left parenthesis 210 degree right parenthesis end cell row blank equals cell cos left parenthesis 30 degree right parenthesis plus fraction numerator 1 over denominator cos left parenthesis 210 degree right parenthesis end fraction end cell row blank equals cell 1 half square root of 3 plus fraction numerator 1 over denominator negative begin display style 1 half end style square root of 3 end fraction end cell row blank equals cell 1 half square root of 3 minus 2 over 3 square root of 3 end cell row blank equals cell square root of 3 open parentheses 1 half minus 2 over 3 close parentheses end cell row blank equals cell negative 1 over 6 square root of 3 end cell row blank blank blank end table end style 

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