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(a) Prove that ^3sqrt(x^3+7)-^3sqrt(x^3+...

(a) Prove that `^3sqrt(x^3+7)-^3sqrt(x^3+4)` is approcimately equal to `1/x^2`when x is large. OR (b) Find the unit vectors perpendicular to each of the vector `veca+vecb and veca-vecb`, where `veca=hati+hatj+hatk` and `vecb=hati+2hatj+3hatk`?

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