Using the formulae in sections 16 and 17 of this page PlanetMath you can simplify to arrive at a value of 1/16.
Similarly you can get .
You also need to remember that .
Using the formulae in sections 16 and 17 of this page PlanetMath you can simplify to arrive at a value of 1/16.
Similarly you can get .
You also need to remember that .