How to rotate a camera relative to the player ?

Hey guys, I am making a car game as my first game in unity.
I want the camera to rotate relatively to the car. I was able to move the camera relatively to the car, but I do not know how to rotate it.
This is an example of a code I wrote, that does not work :

playerAngle = new Vector3 (player.transform.rotation.eulerAngles.x, player.transform.rotation.eulerAngles.y, player.transform.rotation.eulerAngles.z); cameraAngle = new Vector3 (transform.rotation.eulerAngles.x,transform.rotation.eulerAngles.y, transform.rotation.eulerAngles.z);
cameraAngle = playerAngle;

Thank you for your support !