Question

Aratati ca a= ($\frac{1}{2}$ -$\sqrt{3}$ )² + ([tex] \frac{ \sqrt{3} }{2}
[/tex] + 1 )² + ( 1 - √5 ) * (1+√5) este numar intreg

Answer 1

a=(1/2-√3)²+(√3/2+1)²+(1-√5)*(1+√5)=1/4+3-√3+3/4+1+√3-4=4/4+4-4=1