In a quadrilateral A B C D , vec A C is ...

In a quadrilateral `A B C D , vec A C` is the bisector of ` vec A Ba n d vec A D` , angle between ` vec A Ba n d vec A D` is `2pi//3` , `15| vec A C|=3| vec A B|=5| vec A D|dot` Then the angle between ` vec B Aa n d vec C D` is `cos^(-1)(sqrt(14))/(7sqrt(2))` b. `cos^(-1)(sqrt(21))/(7sqrt(3))` c. `cos^(-1)2/(sqrt(7))` d. `cos^(-1)(2sqrt(7))/(14)`

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In a quadrilateral A B C D , vec A C is the bisector of vec A Ba n d vec A D , angle between vec A Ba n d vec A D is 2pi//3 , 15| vec A C|=3| vec A B|=5| vec A D|dot Then the angle between vec B Aa n d vec C D is (a) cos^(-1)(sqrt(14)/(7sqrt(2))) b. cos^(-1)(sqrt(21)/(7sqrt(3))) c. cos^(-1)(2/(sqrt(7))) d. cos^(-1)((2sqrt(7))/(14))

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