16. then is equal to
Given the equation:
we can migrate the term to the R.H.S.
then we have;
Take or .
So, we conclude that;
Therefore we can put the value of in equation (1) we get,
Putting x= sin y, in the above equation; we have then,
So, we have the solution;
Therefore we have .
When we have , we can see that :
So, it is not equal to the R.H.S.
Thus we have only one solution which is x = 0
Hence the correct answer is (C).