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Nilai cos ( − 4 5 ∘ ) − sin ( − 51 0 ∘ ) = ...

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Z. Apriani

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

Jawaban terverifikasi

Pembahasan

Dengan menggunakan konsep trigonometri diperoleh: Jadi,

Dengan menggunakan konsep trigonometri diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row cell cos left parenthesis negative 45 degree right parenthesis end cell equals cell cos left parenthesis 360 degree minus 45 degree right parenthesis end cell row blank equals cell cos left parenthesis 45 degree right parenthesis end cell row blank equals cell 1 half square root of 2 end cell end table

table attributes columnalign right center left columnspacing 0px end attributes row cell sin left parenthesis negative 510 degree right parenthesis end cell equals cell sin left parenthesis 360 degree minus 510 degree right parenthesis space space end cell row blank equals cell sin left parenthesis negative 150 degree right parenthesis end cell row blank equals cell sin left parenthesis 360 degree minus 150 degree right parenthesis end cell row blank equals cell sin left parenthesis 210 degree right parenthesis end cell row blank equals cell sin left parenthesis 180 degree plus 30 degree right parenthesis end cell row blank equals cell negative sin left parenthesis 30 degree right parenthesis end cell row blank equals cell negative 1 half space end cell end table

Jadi, 

table attributes columnalign right center left columnspacing 0px end attributes row cell cos left parenthesis negative 45 degree right parenthesis minus sin left parenthesis negative 510 degree right parenthesis end cell equals cell 1 half square root of 2 minus open parentheses negative 1 half close parentheses end cell row blank equals cell 1 half square root of 2 plus 1 half end cell row blank equals cell 1 half open parentheses square root of 2 plus 1 close parentheses end cell end table

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