please answer no 12
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given that x= 2+√3
therefore ,x^2= 4+4√3+3
=7+4√3
put it in first equation
=(7+4√3)+(1÷(7+4√3))
=((7+4√3)+(7+4√3))÷(7+4√3)
=2(7+4√3)÷(7+4√3)
=2 answer may be help you
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