Write the following functions in the simplest form:
We will solve this problem on the bases of the identity 1 - sin2θ = cos2θ
So, for a2 - x2, we can substitute x=a sinθ or x = a cosθ
Now, Let us put 
Therefore,
Hence, 
9
Write the following functions in the simplest form:
We will solve this problem on the bases of the identity 1 - sin2θ = cos2θ
So, for a2 - x2, we can substitute x=a sinθ or x = a cosθ
Now, Let us put
Therefore,
Hence,