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If x=tan(1/alogy) , show that (1 + x^2)(...

If `x=tan(1/alogy)` , show that `(1 + x^2)(d^2y)/(dx^2) + (2x - a)(dy)/(dx) = 0`

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`(1 + x^2) (d^2y)/(dx^2) + (2x - a)(dy)/(dx) = 0`
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