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Let a=a_(1) hati+a_(2) hatj+a_(3) hatk Assertion (A) The identity |veca xx hati|^(2)+|veca xx hatj|^(2)+|veca xx hatk|^(2)=2|veca|^(2) holds for veca. Reason (R) veca xx hati=a_(3)hatj-a_(2) hatk, vec a xx hatj=a_(1) hatk-a_(3) hati, veca xx hatk=a_(2) hati-a_(1)hatj

Answer»

Both A and R are true and R is the CORRECT EXPLANATION of (A)
Both A and R are true and R is not the correct explanation of (A)
(A) is true but (R) is FALSE
A is false but R is true

Answer :A


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