Rút gọn các biểu thức :

A= \(\sqrt{3}\) sin ( x - \(\dfrac{\pi}{3}\) ) + sin ( x + \(\dfrac{\pi}{6}\) )

B= cos7x cos5x - \(\sqrt{3}\) sin2x + sin7x sin5x

C= 2sin( 2x -\(\dfrac{\pi}{6}\)) + 4sin + 1

D= \(\sqrt{3}\) cos2x + sin2x + 2sin(2x - \(\dfrac{\pi}{6}\))

E= sin2x + 2\(\sqrt{2}\) cosx + 2sin(x + \(\dfrac{\pi}{4}\)) +3