E = 2cos$30^{\circ}$ + sin$150^{\circ}$ + tan$135^{\circ}$
= 2sin$60^{\circ}$ + sin$30^{\circ}$ - tan$45^{\circ}$
= 2. $\frac{\sqrt{3}}{2}$ + $\frac{1}{2}$ - 1 = $\frac{-1 + 2\sqrt{3}}{2}$
E = 2cos$30^{\circ}$ + sin$150^{\circ}$ + tan$135^{\circ}$
= 2sin$60^{\circ}$ + sin$30^{\circ}$ - tan$45^{\circ}$
= 2. $\frac{\sqrt{3}}{2}$ + $\frac{1}{2}$ - 1 = $\frac{-1 + 2\sqrt{3}}{2}$