4.10.2 Greatest hits from previous weeks

4.10.2.1 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 (25 votes), answered by Simon (32 votes)

4.10.2.2 Calculate the 2D Fourier transform of an Image

http://mathematica.stackexchange.com/questions/29203/calculate-the-2d-fourier-transform-of-an-image

 
I am new to Mathematica, and using version 8.0. 
 
I would like to calculate the 2D Fourier Transform of an Image with Mathematica and plot the magnitude and phase spectrum, as well as reconstruct the  ...
                                                                                  

                                                                                  
 

- asked by user8727 (5 votes), answered by Nasser (27 votes)