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Question

If ¯¯¯d=λ(¯¯¯aׯ¯b)+μ(¯¯bׯ¯c)+δ(¯¯cׯ¯¯a) and [¯¯¯a¯¯b¯¯c]=18 then λ+μ+δ=

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Solution

d=λ(a×b)+μ(b×c)+δ(vecc×a)
[ab×c]=18
a.(bc)=18
b.(ca)=18
c.(ab)=18
a.d=μ8
b.d=δ8
c.d=λ8
δ(a+b+c).d=μ+δ+λ
[ a.(a×b)=0]


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