>>66
{(-1+√5)/2}=1/{(1+√5)/2}なので
 
{(1+√5)/2}log{(1+√5)/2}+{(-1+√5)/2}log{(-1+√5)/2}+2-√5
={(1+√5)/2}log{(1+√5)/2}-{(-1+√5)/2}log{(1+√5)/2}+2-√5
=log{(1+√5)/2}+2-√5