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Find x , if (13^3 + 7^3)/(13^2 + 7^2 - ...

Find x , if `(13^3 + 7^3)/(13^2 + 7^2 - x) = 20`

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The correct Answer is:
`=(2)/(pi) {sqrt(x-x^(2))-(1-2x)sin^(-1)sqrt(x)}-x+C`
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