Question

Mohon bantunnya kakak-kakak

Answer 1

4) g = (8-6,1-4,-2+3) = (2,-3,1)

h = (10-9,8-6,1-4) = (1,2,-3)

g•h = |g||h| cos A

2 - 6 - 3 = √14 x √14 x cos A

-7 = 14 cos A

cos A = -0.5

cos A = 120°

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