Hello friends, I know, and there is this formula for the sum of sines:

and there is one for the sum of cosines,

I wonder if there is a similar to this:

greetings

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- Dec 30th 2009, 06:16 AMDogod11formula
Hello friends, I know, and there is this formula for the sum of sines:

and there is one for the sum of cosines,

I wonder if there is a similar to this:

greetings - Dec 30th 2009, 06:36 AMskeeter
- Dec 30th 2009, 07:06 AMDogod11
thanks

- Dec 30th 2009, 07:28 AMmathaddict