(4+ \sqrt{15})(\sqrt{10}-\sqrt6) *\sqrt{4 - \sqrt{15}} = 2
(4\sqrt{10}-4\sqrt6+\sqrt{150}-\sqrt{90})*\sqrt{4-\sqrt{15}}=2
\sqrt2(4\sqrt5-4\sqrt3+\sqrt{75}-\sqrt{45})*\sqrt{4-\sqrt{15}}=2
\sqrt2*\sqrt{4-\sqrt{15}}*(4\sqrt5-4\sqrt3+5\sqrt3-3\sqrt5)=2
\sqrt{2(4-\sqrt{15})}*(\sqrt5+\sqrt3)=2 \ |^2
2(4-\sqrt{15})*(\sqrt5+\sqrt3)^2=4
(8-2\sqrt{15})(5+2\sqrt{15}+3)=4
(8-2\sqrt{15})(8+2\sqrt{15})=4
8^2-(2\sqrt{15})^2=4
64-4*15=4
4=4
L=P