evaluate {under root 5 +2 under root6}+under root8-2 underroot 5}
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√5 +2√6 +√8 -2√5
=√5-2√5+2√6-√(2*2)*2
=-√5+2√6 -2√2
=√5-2√5+2√6-√(2*2)*2
=-√5+2√6 -2√2
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