1.

Let 2 planes are being contained by the vectors alpha hati+3hatj-hatk, hati+(alpha-1)hatj+2hatk and 3hati+5hatj+2hatk. If the angle between these 2 planes is theta, then the value of cos^(2)theta is equal to

Answer»

`(15)/(17)`
`(289)/(717)`
`(289)/(2151)`
`(17)/(2151)`

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