1.

सिद्ध कीजिए कि |vecA xx vecB|^(2) + |vecA * vecB|^(2) = (AB)^(2).

Answer»

zero
`A^(2)B^(2)`
AB
`sqrt(AB)`

Solution :LET `theta` be ANGLE between vectors `vec(A)andvce(B)`
`:.|vec(A)xxvec(B)|=ABsinthetaand|vec(A).vec(B)|=ABc ostheta`
`:.|vec(A)xxvec(B)|^(2)+|vec(A).vec(B)|^(2)=(ABsintheta)^(2)+(ABcostheta)^(2)`
`=A^(2)B^(2)sin^(2)cos^(2)theta=A^(2)B^(2)`


Discussion

No Comment Found