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If x - 2y = 3 and xy = 5, find the value...

If x - 2y = 3 and xy = 5, find the value of `x^2-4y^2`.
यदि x - 2y = 3 तथा xy = 5 है, तो `x^2-4y^2` का मान क्या होगा ?

A

22

B

20

C

23

D

21

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