Question 374131
Simply multiply by {{{sqrt(5)/sqrt(5)}}} (which is essentially 1) and simplify to get:


{{{sqrt(2)/sqrt(5)=(sqrt(2)/sqrt(5))*(sqrt(5)/sqrt(5))=(sqrt(2)sqrt(5))/(sqrt(5)sqrt(5))=(sqrt(10))/5}}}



So {{{sqrt(2)/sqrt(5)=(sqrt(10))/5}}}



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