1. Apr 24, 2009 #1

   synergix

   

   1. The problem statement, all variables and given/known data
   simplify cosx⁴-sinx⁴
   
   
   3. The attempt at a solution
   
   I got cos2x
   
   does anybody wanna solve this and let me know if I am right ?

    

   synergix, Apr 24, 2009
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3. Apr 24, 2009 #2

   srvs

   

   Cos2x is correct.

    

   srvs, Apr 24, 2009
4. Apr 24, 2009 #3

   tiny-tim

   

   Science Advisor

   Homework Helper

   Hi synergix!
   
   It's obviously cos2x …
   
   if you're not sure, then either you didn't go the quick way (factorise a⁴ - b⁴ ), or you're not familiar enough with your trignonometric identities

    

   tiny-tim, Apr 24, 2009

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