2.4.2 Greatest hits from previous weeks

2.4.2.1 Where can I find examples of good Mathematica programming practice?

http://mathematica.stackexchange.com/questions/18/where-can-i-find-examples-of-good-mathematica-programming-practice

 
I consider myself a pretty good Mathematica programmer, but I'm always looking out for ways to either improve my way of doing things in Mathematica, or to see if there's something nifty that I haven't  ...
 

- asked by Guess who it is. (352 votes), answered by faysou (323 votes)

2.4.2.2 How to express trigonometric equation in terms of of given trigonometric function?

http://mathematica.stackexchange.com/questions/434/how-to-express-trigonometric-equation-in-terms-of-of-given-trigonometric-functio

 
How can I express a trigonometric equation / identity in terms of a given trigonometric function? 
 
using following trigonometric identities 
 
Sin[x]^2+Cos[x]^2==1 
Sin[x]/Cos[x]==Tan[x] 
...
                                                                                  

                                                                                  
 

- asked by Prashant Bhate (17 votes), answered by Simon (24 votes)