# Revision history [back]

Well, it is hard to decide which is a simplified version of the other. For many, the first expression is simpler than the second since the involved trigonometric functions are eveluated on x, not pi/6-x. But i agree that something might be missing to express what kind of modification the user expect from Sage.

However, Sage somehow knows that the two expressions are equal:

sage: bool((sqrt(3)/3*cos(x)+1/3*sin(x)) == 2/3*cos(pi/6-x))
True


sage: (sqrt(3)/3*cos(x)+1/3*sin(x)).full_simplify()