Question: I need help in this please and fast I'm so confused with this thank you so much!! 18. A triangle in R has two sides

I need help in this please and fast I'm so confused

I need help in this please and fast I'm so confused with this thank you so much!!

with this thank you so much!! 18. A triangle in R has

18. A triangle in R has two sides represented by the vectors O4 = (1, 3,-1) and OB = (2, 4, 1). Determine the measures of the angles of the triangle. Explain

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