SOLUTION: rewirte sin x^4 so that it involves only the first power of cosine..? stuck lol

Algebra ->  Trigonometry-basics -> SOLUTION: rewirte sin x^4 so that it involves only the first power of cosine..? stuck lol      Log On


   

Question 618404: rewirte sin x^4 so that it involves only the first power of cosine..? stuck lol
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


I presume you mean



Which is to say



As opposed to



which is what you actually wrote.

Given that, write:



Then use the Pythagorean identity:



Then use the difference of two squares factorization:



Which is the desired result.

John

My calculator said it, I believe it, that settles it
The Out Campaign: Scarlet Letter of Atheism