The correct option is
A Explanation for the correct option :
Step-1 : (Simplify the expression )
Step-2 : Simplify the expression
We can write,
So,
Step-3 : Evaluate
Formula to be used : We know that
So, we get the following identity
Step-4 : Evaluate
Using the identity obtained in Step-3, we get
Hence, option (A) is the correct answer.