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If the equation y=px+asqrt(1+p^2) is reg...

If the equation `y=px+asqrt(1+p^2)` is regarded as a quadratic equation in `p` it will have equal roots if `x^2+y^2=` (A) -`a^2` (B) 0 (C) `a^2` (D) none of these

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