 Hi and welcome to the session. I am Deepika here. Let's discuss the question find the principal value of cos inverse root 3 by 2 So first we will see what is the range of the principal value branch of cos inverse x? so the range of Y is equal to cos inverse x the range of its principal value branch is closed interval 0 to pi So let's start the solution inverse root 3 by 2 is equal to Y Then so which is equal to 0 to pi 3 by 2 Therefore the principal value of answer for the above question. I hope the question is clear to you. Bye and enjoy yourself