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August 31, 2015

Homework Help: math

Posted by jessika on Thursday, November 15, 2007 at 7:31pm.

i have a few questions

cosx + cosx =2secx
----- -----
1+sinx 1-sinx


cos(x-B)-cos(x-B) = 2sinxsinB


csc2x= 1 secx cscx
---
2


cotx= cos5x+cos3x
-----------
sin 5x-sin 3x

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