यदि x^(4) + x^(2) y^(2) + y^(4) = 21और x...

यदि `x^(4) + x^(2) y^(2) + y^(4) = 21`और `x^(2) + xy + y^(2) = 7` है, तो `((1)/( x^2) + (1)/(y^2) )` का मान ज्ञात करेI

A

`(7)/(4)`

B

`(5)/(4)`

C

`(7)/(3)`

D

`(5)/(2)`

लिखित उत्तर

Verified by Experts

The correct Answer is:

B

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