Thursday
September 18, 2014

Homework Help: Math - Trigonometry

Posted by Sam on Wednesday, November 6, 2013 at 7:22am.

Let f(x) be a polynomial such that f(cos theta) = cos(4 theta) for all \theta. Find f(x). (This is essentially the same as finding cos(4 theta) in terms of cos theta; we structure the problem this way so that you can answer as a polynomial. Be sure to write your polynomial with the terms in order of decreasing degree.)
I tried this problem but I don't know if this is correct or not. I got 8 cos^4x + 8 cos^2x + 1. Is this right?
Thanks.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Math - Let f(x) be a polynomial such that f(cos theta) = cos(4 theta) for all ...
Calculus - I wanted to confirm that I solved these problems correctly (we had to...
trigonometry - can you correct the rest for me please? Express each as a ...
trigonometry - can you correct the rest for me please? Express each as a ...
Physics - An object is shot at 20m/s at an angle theta. The object lands 24m ...
math(Trigonometry) - sin 2 theta + cos theta = 0 so, we use sin 2 theta = 2 sin ...
trigonometry - I need help in understanding how to identify which identity to ...
Algebra II - Multiple Choice Which expression is NOT equivalent to 1? (theta) ...
Trigonometry (repost Reiny) - at 1:35am I posted ; Write equivalent equations in...
Precalculus 2 - Similiarly to a question I asked previously I took the same ...

Search
Members