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Find the angle between the following pair of line: `r=2hati-=5hatj+hatk+lamda(3hati+2hatj+6hatk) and vecr=7hati-6hatk+mu(hati+2hatj+2hatk)`

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Find the angle between the following pair of line: `r=2hati-=5hatj+hatk+lamda(3hati+2hatj+6hatk) and vecr=7hati-6hatk+mu(hati+2hatj+2hatk)`
A. `cos^(-1) (19/21)`
B. `cos^(1)(21/19)`
C. `cos^(-1)(15/21)`
D. `cos^(-1) (21/15)`
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Correct Answer - A
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