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[" 27.The values of "a" for which the po...

[" 27.The values of "a" for which the points "A,B," and "C" with "],[" position vectors "2hat i-hat j+hat k,hat i-3hat j-5hat k," and "C" ,with "],[" respectively,are the vertices of a right-angled triangle "],[" with "C=pi/2" are "],[[" (a) "2" and "1," (b) "-2" and "-1],[" (c) "-2" and "1," (d) "2" and "-1]],[" 8.If "hat u" and "hat v" are unit vecters end pires? "]

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