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The tangent to x^(2)//a^(2)+y^(2)//b^(2)...

The tangent to `x^(2)//a^(2)+y^(2)//b^(2)=1` meets the major and minor axes in P and Q respectively, then `a^(2)//CP^(2)+b^(2)//CQ^(2)=`

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