Let veca , vecb and vec c be non copl...

Let `veca , vecb` and `vec c ` be non coplanar unit vectors equally inclined to one another at an acute angle `theta` . Then `|[veca vecb vec c]|` in terms of `theta` is equal to

`(1 + cos theta ) sqrt ( cos 2 theta ) `

`(1 + cos theta ) sqrt (1 - 2 cos theta)`

`(1 - cos theta) sqrt (1 + 2 cos theta)`

None of these

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