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The lines a^2x^2+bcy^2=a(b+c)xy will be ...

The lines `a^2x^2+bcy^2=a(b+c)xy` will be coincident , if

A

`a=0` or `b=c`

B

`a=b` or `a=c`

C

`c=0` or `a=b`

D

`a=b+c`

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