(√2+√5-√3)/(2√30-6√2+4√3)=(√2+√5-√3)/[2(√30-3√2+2√3)]=(√2+√5-√3)/[2(√30-√18+√12)]=(√2+√5-√3)/[2√6(√5-√3+√2)]=1/(2√6)=√6/(√6*2√6)=√6/12
