Soal B

Diketahui sin 48,59 = 0,75. Maka cos 138,59 adalah …

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Diketahui sin space 48 comma 59 to the power of degree equals 0 comma 75 space text maka end text cos space 138 comma 59 to the power of degree spaceadalah ....

Jawaban

nilai dari cos space 138 comma 59 to the power of degree spaceadalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell negative 0 comma 75. end cell end table

 

Pembahasan

Diketahui sin space 48 comma 59 to the power of degree equals 0 comma 75 spacedan 138 comma 59 to the power of degree equals 90 degree plus 48 comma 59 degree spacemaka cos open parentheses 138 comma 59 close parentheses degree equals cos open parentheses 90 degree plus 48 comma 59 degree close parentheses. Berdasarkan identitas trigonometri yaitu cos open parentheses 90 degree plus x degree close parentheses equals negative sin space x degree comma maka

table attributes columnalign right center left columnspacing 0px end attributes row cell cos open parentheses 138 comma 59 close parentheses degree end cell equals cell cos open parentheses 90 degree plus 48 comma 59 degree close parentheses end cell row cell cos open parentheses 138 comma 59 close parentheses degree end cell equals cell negative sin open parentheses 48 comma 59 close parentheses degree end cell row cell cos open parentheses 138 comma 59 close parentheses degree end cell equals cell negative 0 comma 75 end cell end table

Jadi nilai dari cos space 138 comma 59 to the power of degree spaceadalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell negative 0 comma 75. end cell end table

Dijawab Oleh : Kunjaw

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