1.

If the angle between overline(a) and overline(b) is (P1)/(4) and overline(c)=3overline(a)-3overline(b), then c^(2)=

Answer»

`9A^(2)+SQRT(2)ab+4b^(2)`
`9a^(2)-6sqrt(2)ab+4b^(2)`
`9a^(2)-6AB+4b^(2)`
`9a^(2)+b^(2)+6ab`

Answer :B


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