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If the lines (p-q)x^2+2(p+q)xy+(q-p)y^2=...

If the lines `(p-q)x^2+2(p+q)xy+(q-p)y^2=0` are mutually perpendicular , then

A

(a) `p=q`

B

(b) `q=0`

C

(c) `p=0`

D

(d) p and q may have any value

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The correct Answer is:
D

NA
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