If I have a rotation matrix:
(-0.7 0.7)
(-0.7 -0.7)
how can I get the angle and the direction of it?
If I do:
(cos-1(-0.7) -sin-1(0.7)
(sin-1(-0.7) cos-1(-0.7)
I get:
(134 -44)
(-44 134)
which are two different angles, 135 and -44 in degrees, how do I know which one is the answer and what direction the rotation is happening?
I couldn't find anything on the internet, so any links explaining how to get the angle and the direction would be grateful.