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Vectors vec a\ a n d\ vec b are inclin...

Vectors ` vec a\ a n d\ vec b` are inclined at angel `theta=120^0` . If `| vec a|=1,\ | vec b|=2,\ ` then `[( vec a+3 vec b)xx(3 vec a- vec b)]^2` is equal to `300` b. `235` c. `275` d. 225

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