Given two matrices cow$2$wld and wld$2$cam, a cow can be transformed to the camera space using wld$2$cam $*$ cow$2$wld$.$

Here, cow$2$wld which transfrom a cow from the object coordinates to the world coordinates, wld$2$cam which transform a cow from the world coordinates to the camera coordinates, $Rx$ is the rotation matrix. You can use a$.$R$,$ a$.$T to denote the rotation and translation part of the matrix, that is$,a=a.T*a.R$

a$)$ describe how to rotate a cow along $x-$axis in the object space

b$)$ describe how to rotate the cow along the $x-$axis of the world space.

c$)$ describe how to rotate the cow along the $x-$axis of the camera space.