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Q 1103345248.     The angle between the lines `vecr=(2veci-3vecj+veck)+lambda(veci+4vecj+3veck)` and `(veci-vecj+2veck)+mu(veci+2vecj-3veck)` is

A

`pi/2`

B

`cos^-1(9/sqrt91)`

C

`cos^-1(7/sqrt84)`

D

`pi/3`

HINT

Use `costheta=(a_1a_2+b_1b_2+c_1c_2)/sqrt((a_1^2+b_1^2+c_1^2).(a_2^2+b_2^2+c_2^2))`

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