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1. Tentukan nilai dari: c. cos 4 5 ∘ cos 22 5 ∘ cos 24 0 ∘ cos 30 0 ∘ sin 4 5 ∘ sin 13 5 ∘ sin 12 0 ∘ sin 33 0 ∘ ​

1. Tentukan nilai dari:

c.       

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R. Diah

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

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Pembahasan

begin mathsize 14px style fraction numerator sin space 45 degree space sin space 135 degree space sin space 120 degree space sin space 330 degree over denominator cos space 45 degree space cos space 225 degree space cos space 240 degree space cos space 300 degree end fraction equals fraction numerator sin space 45 degree space sin space open parentheses 180 minus 45 close parentheses degree space sin space open parentheses 180 minus 60 close parentheses degree space sin space open parentheses 360 minus 30 close parentheses degree over denominator cos space 45 degree space cos space open parentheses 180 plus 45 close parentheses degree space cos space open parentheses 180 plus 60 close parentheses degree space cos space open parentheses 360 minus 60 close parentheses degree end fraction equals fraction numerator sin space 45 degree space sin space 45 degree space sin space 60 degree space open parentheses negative sin space 30 degree close parentheses over denominator cos space 45 degree space open parentheses negative cos space 45 degree close parentheses space open parentheses negative cos space 60 degree close parentheses space cos space 60 degree end fraction equals fraction numerator open parentheses begin display style 1 half end style square root of 2 close parentheses space open parentheses 1 half square root of 2 close parentheses space space open parentheses 1 half square root of 3 close parentheses space open parentheses negative 1 half space close parentheses over denominator open parentheses 1 half square root of 2 close parentheses space open parentheses negative 1 half square root of 2 close parentheses space open parentheses negative 1 half close parentheses space open parentheses 1 half close parentheses end fraction equals fraction numerator negative open parentheses 1 half square root of 3 close parentheses over denominator begin display style 1 half end style end fraction equals negative square root of 3 end style 

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