1.

Two systems of rectangular axes have the same origin. If a plane cuts them at distances a, b, c and a_1, b_1, c_1respectively from the origin, then a^(-2) + b^(-2) + c^(-2)

Answer»

`a_(1)^(-2) + b_(1)^(-2) + c_(1)^(-2)`
`a^2 + B^2 +c^2`
`a^(-2) + b^(-2) + c^(-2) `
NONE

ANSWER :A


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