Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) If `veca,vecb` are two unit vectors such that `veca+(veca xxvecb)=vecc`,where`|vecc|=2`, then the value of `[vecavecbvecc]` is - Sarthaks eConnect

If `veca,vecb` are two unit vectors such that `veca+(veca xxvecb)=vecc`,where`|vecc|=2`, then the value of `[vecavecbvecc]` is:

If `veca,vecb` are two unit vectors such that `veca+(veca xxvecb)=vecc`,where`|vecc|=2`, then the value of `[vecavecbvecc]` is:

A.

0

B.

`+-1`

C.

-3

D.

3

Solution

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Best answer

`veca+(vecaxxvecb)=vecc`

`veca.vecc+(vecaxxvecb).vecc=vecc.vecc`

`veca.vecc+R =4` .....(1)

`veca.veca+(vecaxxvecb).veca=vecc.veca`

`1+0=vecc.veca` ..........(2)

from (1) and (2)

`R[vecavecbvecc]=3`