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(22) if vec p and vec qare unit vectors ...

(22) if `vec p and vec q`are unit vectors forming an angle of `30^@`; find the area of the parallelogram having `veca=vecp+2vecq and vecb=2vecp+vecq` as its diagonals. (23) For any two vectors ` vec a` and ` vec b` , prove that `| vec a xxvec b|^2=| [vec a* vec a ,vec a*vec b],[ vec b* vec a, vec b* vec b]|` .

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