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If ax+by=1 and cx^2 + d^2 …

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If ax+by=1 and cx^2 + d^2 =1 has only one solution then- (A) a^2/c + b^2/d =1 (B) c^2/a + d^2/b =1 (C) a^2/b + c^2/d =1 (D) none of these
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