Math Is Fun Forum

Hi Friends,

For my work, I need to calculate fixed values of cos/sine function.
Can you tell me the right approach:

1) Do I use a lookup available somewhere
2) Is there a formula/shortcut that will help me in this

For example, currently I am looking for values for:
* m1 = cos(4pi/16)
* m2 = cos(6pi/16)
* m3 = cos(2pi/16) - cos(6pi/16)
* m4 = cos(2pi/16)+ cos(6pi/16))

Regards,