Как это решить?

[tex]( \frac{2}{a} + \frac{1}{b} ) \times \frac{1}{a {}^{2} + 4b {}^{2} + 4ab} \times (a {}^{2} - 4b {}^{2} )[/tex]
при
[tex]a = 2 \sqrt{5} + 2[/tex]
и
[tex]b = \sqrt{5} - 1[/tex]
Можно фото, пожалуйста
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