The angle between two vectors −2i^+3j^+k^ and 2i^+2j^−4k^ is

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obtuse

right angle

acute

can't say

answer is A.

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Detailed Solution

Let A→ = −2i^+3j^+k^ B→ = 2i^+2j^−4k^A→.B→=-2×2+3×2+1×(-4) = -2Since dot product is negative, so angle between vectors is obtuse.

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