Question

1. Ifa=(2,1,-1), b=(1,-1,2) and c = (1,–2,1) then find the direction cosines of a+b-2c.
Ans.​

Answer 1

Answer:

a=2+1+1 =4

b=1-1-2 =-2

c=-1+2+1 =2

a+b-2c= 4+-2-4

a+b-2c= -2

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