Find the values of lambda for which the ...

Find the values of `lambda` for which the angle between the vectors `vec(a) = 2lambda^(2) hat(i) + 4lambda hat(j) + hat(k)` and `vec(b) = 7hat(i) - 2hat(j) + lambda hat(k)`

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The correct Answer is:

`0 lt lambda lt (1)/(2)`

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