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If a^2+b^2+c^2=1,t h e na b+b c+c a lie ...

If `a^2+b^2+c^2=1,t h e na b+b c+c a` lie in the interval

a.`[1/3,2]`

b. `[-1,2]`

c. `[-1/2,1]`

d. `[-1,1/2]`

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