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Fundamental Theorem in 2D

If 2,-1,2 a...

Question

If $(2, - 1, 2)$ and $(K, 3, 5)$ are the triads of direction ratios of two lines and the angle between the, is $45^{0}$ ,then a value of K is...

2

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3

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4

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6

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Solution

The correct option is C $4$
12√=2K−3+103K2+34√
Verification K $= 4$

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