Easing with rotation

I have tried easing a movie clip using the _x property but when i try to use this code for rotation i never get an accurate result

mc._rotation += (angle + mc._rotation)*.1

where:
mc = my movie clip whose initial rotation is 0
angle = the angle by which i would like to rotate the movie clip by.

when you say easing, what do you mean exactly? do you want to have the rate of rotation slow down to a stop rather than move at constant speed?

I think the problem is in your math.

mc._rotation += (angle-mc._rotation)*0.1;