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Let vec a* vec b=0,w h e r e vec aa n d...

Let ` vec a* vec b=0,w h e r e vec aa n d vec b` are unit vectors and the unit vector ` vec c` is inclined at an angle `theta` to both ` vec aa n d vec bdot` If ` vec c=m vec a+n vec b+p( vec axx vec b),(m ,n , p in R),` then a.`-pi/4lt=thetalt=pi/4` b. `pi/4lt=thetalt=(3pi)/4` c. `0lt=thetalt=pi/4` d. `0lt=thetalt=(3pi)/4`

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