jika a=4 b=2 c=3 berapa nilai cos alfa
Matematika
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Pertanyaan
jika a=4 b=2 c=3 berapa nilai cos alfa
1 Jawaban
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1. Jawaban nallsst
a² = b² + c² - 2.b.c.cos@
4² = 2² + 3² - 2.2.3.cos@
16 = 4 + 9 - 12cos@
16 = 13 - 12cos@
3 = -12cos@
cos@ = [tex]- \frac{3}{12} [/tex]
= [tex] -\frac{1}{4} [/tex]