bentuk -2 cos (x+30 derajat) - 2sin (x+30 derajat) dapat disederhanakan menjadi.... mohon di jawab beserta caranya

-2 cos (x+30) - 2sin (x+30)= -2 (cos (x+30) + sin (x+30))
= -2 [(cosx.cos30 - sinx.sin30) + (sinx.cos30 + cosx.sin30)]
= -2 [ cosx.1/2√3 - sinx.1/2 + sinx.1/2√3 + cosx.1/2]
= -2 [ 1/2√3.cosx - 1/2sinx +1/2√3.sinx + 1/2cosx]
= -2 [1/2√3.cosx + 1/2cosx - 1/2sinx +1/2√3.sinx]
= - √3.cosx - cosx + sinx - √3.sinx
= ( -√3 - 1).cosx + (1-√3)sinx