Evaluate the following expressions.

a.  $\sin \left( \sin^{-1} \left( \frac{\sqrt{3}}{2} \right) \right) =$

b.  $\cos \left( \cos^{-1} \left( 1 \right) \right) =$

c.  $\tan \left( \tan^{-1} \left( 0 \right) \right) =$