@@ old questions not answered yet if anyone wants to take a look
http://web2.0calc.com/questions/sin-3a-8-sina-2-sin-2a-2sina-4 Answered by reinout. Thanks reinout!
http://web2.0calc.com/questions/solve-power-series-4-n-2-2-n-6-8-n-2-n-8 Answered by Alan - Thanks Alan!
http://web2.0calc.com/questions/a-cereal-company-is-giving-away-1-of-6-different-prizes-in-each-cereal-box-descr-a-simulation-you-could-use-to-estimate-the-number-of-boxe Answered by reinout-g - thank you reinout!