WEBVTT
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All right, So first, let's find the magnitude
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today. Ninety two today is one squared plus negative
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. Four squared plus one squared. That is rad
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eighteen. Just three, right, too magnitude of
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B zero squared plus two squared, plus native to
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squared. You're at a just to read, too
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. We also want to find the dog product,
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right. We're going to be using this formula,
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obviously, eh? B a b o sign.
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Okay, so the dot product is one time zero
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last night of two night of four times. Two
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last one times native to this is negative. Ten
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. Co signed data. Just a dot Be over
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, eh? B is the negative ten over three
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. Rad. Two times to read too. His
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negative turn over twelve. This is, uh we
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divide by to hear, Get negative. Not they
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does equal to co sign in verse. Uh,
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far native five, six. Okay, so turn
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that into a calculator. I divided by six negative
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of that coast on inverse. Yeah, one hundred
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forty six degrees