Find the angle between the following pai...

Find the angle between the following pairs of lines :
(i) `vecr=2hati-5hatj+hatk+lambda(3hati+2hatj+6hatk)` and `veck=7hati-6hatk+mu(hati+2hatj+2hatk)`
(ii) `vecr=3hati+hatj-2hatk+lambda(hati-hatj-2hatk)` and `vecr=2hati-hatj-56hatk+mu(3hati-5hatj-4hatk)`

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Verified by Experts

The correct Answer is:

(i) `therefore theta=cos^(-1)((19)/(21))`
(ii) `therefore theta=cos^(-1)((8)/(5sqrt3))`

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