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If a,b,c be the unit vector such that b is not parallel to c and a×(2b×c)=b then angel that a make with b and c respectively is ?
the equation becomes:2[(a.c)b – (a.b)c]=bb[2(a.c) – 1]= (a.b)cso, a.b=0 and 2(a.c) – 1=0 or cosθ=1/2=cos60so, angle between a and b is 90 degreeand angle between a and c is 60 degree
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