cos 2x = cos^2 x - sin^2 x=1- 2 sin^2 x = 2cos^2 x - 1f(x)=sinx + cosx + √3(cos^2 x - sin^2 x) - 1=√3cos^2 x + cos x - √3sin^2 x + sin x - 1
f(x)=sinx + cosx + √3(cos^2 x - sin^2 x) - 1=√3cos^2 x + cos x - √3sin^2 x + sin x - 1