The angle between two vectors A =< 5,1,7> B =<5,7,1> -1 0 cos Ө Ө -A 39 (²2) - B 75. 39 -1 = COS - C 5625/ not of above-D ET LIS = COS-¹

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A: We have to find number of vectors have length 1 and dot product with (-1,7,2)=0.

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A: Here given vector as a=3i+j+2k, b=2i-2j+4k Thus a=32+1+22=9+1+4=14 a=22+-22+42=4+4+16=24=26

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