Solve for a_2, a_4
a_{2}=\sqrt{35}+6\approx 11.916079783\text{, }a_{4}=6-\sqrt{35}\approx 0.083920217
a_{2}=6-\sqrt{35}\approx 0.083920217\text{, }a_{4}=\sqrt{35}+6\approx 11.916079783
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