TeX source:
\mathtt{(1+\sqrt{3}+\sqrt{5})^{2}+(1-\sqrt{3}-\sqrt{5})^{2}-(2\sqrt{15}+1)^{2}=1+3+5+2\sqrt{3}+2\sqrt{5}+2\sqrt{15}+1+3+5-2\sqrt{3}-2\sqrt{5}+2\sqrt{15}-60-4\sqrt{15}-1=-43}