dhanjita medhi

Hello, for blade oscillation (or amplitude) of 10 degree, I am using a expression of 0.174*43.689[rad/s]*cos(43.689[rad/s]*t) in cell zone conditions under rotatinoal velocity (in which 43.689 rad/s is the rotational speed of the larger rotating domain and expression is for blade domains). In my problem, the blade pitch angle variation is sinusoidal and that's why I am using a expression for rotational speed by derivating the pitch angle expression as dtheta/dt is angular speed. Now I want to check whether blades are pitching with amplitude of 10 degree or not? Can you please help me to measure the angle of rotation of the blades? or how can we check whether my expression is working or not?