February 2019 0 134 Report
Przedstaw w możliwie najprostszej postaci:

\dfrac{\sqrt {\dfrac{1+a}{1-a}}+ \sqrt {\dfrac{1-a}{1+a}}}{\sqrt {\dfrac{1+a}{1-a}}- \sqrt {\dfrac{1-a}{1+a}}}-\dfrac 1a
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