9. (97-6-68) Найти x из условия, что
[tex] \tan( \alpha ) = \frac{3 + \sqrt{x} }{2} [/tex]
[tex] \tan( \beta ) = \frac{3 - \sqrt{x} }{2} [/tex]
[tex] \alpha + \beta = \frac{\pi}{4} [/tex]

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