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(r3+r1)(r3+r2)sinC=2r3sqrt(r2r3+r3r1+r1r...

`(r_3+r_1)(r_3+r_2)sinC=2r_3sqrt(r_2r_3+r_3r_1+r_1r_2)`

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(r_(3)+r_(1))(r_(3)+r_(2))sin C=2r_(3)sqrt(r_(2)r_(3)+r_(3)r_(1)+r_(1)r_(2))

For any three non-zero vectors r_1,r_2 and r_3 .|(r_1.r_1,r_1.r_2,r_1.r_3),(r_2.r_1,r_2.r_2,r_2.r_3),(r_3.r_1,r_3.r_2,r_3.r_3)|=0. Then which of the following is false

r+r_(3)+r_(1)-r_(2)=

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