1.

Find angle theta between the vectors veca=hati+hatj-hatkandvecb=hati-hatj+hatk.

Answer»

`cos^(-1)"" 1/3`
`- cos^(-1) ""1/3`
`- SIN^(-1)""(2 SQRT(2))/( 3)`
`sin^(-1)""(1)/(3)`

Answer :C


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