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AB = B - A = (3,-5,-5)
AC = (10,3,3)
Cos = AB.AC / Panjang AB × Panjang AC
= 30-15-15 / akar 9+25+25 × akar 100+9+9
= 0 / akar 59 × akar 118
= 0
cos = 0
cos 0 adalah 90 derajat
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