rationalize the denominator of root 3 + 1 divided by root 3 minus 1
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√3+1 / √3-1
=√3+1×√3+1 / √3-1×√3+1
=(√3+1)² / (√3)²-(1)²
=√3²+1²+2×√3×1/3-1
=3+1+2√3 / 3-1
=4+2√3 / 3-1
=√3+1×√3+1 / √3-1×√3+1
=(√3+1)² / (√3)²-(1)²
=√3²+1²+2×√3×1/3-1
=3+1+2√3 / 3-1
=4+2√3 / 3-1
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