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Solve cosx^4-sinx^4

  • Thread starter synergix
  • Start date
  • #1
178
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Homework Statement


simplify cosx4-sinx4


The Attempt at a Solution



I got cos2x

does anybody wanna solve this and let me know if I am right ?
 

Answers and Replies

  • #2
31
0
Cos2x is correct.
 
  • #3
tiny-tim
Science Advisor
Homework Helper
25,832
249

Homework Statement


simplify cosx4-sinx4


The Attempt at a Solution



I got cos2x

does anybody wanna solve this and let me know if I am right ?
Hi synergix! :smile:

It's obviously cos2x :biggrin:

if you're not sure, then either you didn't go the quick way (factorise a4 - b4 :wink:), or you're not familiar enough with your trignonometric identities :smile:
 

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