Are trig functions polynomial fuctions?

[zeion]

Homework Statement

Is 3cos²2x + cosx² - 1 a polynomial function?

Homework Equations

The Attempt at a Solution

 

[stevenb]

Homework Statement

Is 3cos²2x + cosx² - 1 a polynomial function?

Homework Equations

The Attempt at a Solution

What is the definition of "a polynomial function"?

 

[Char. Limit]

Well, this function can be arranged to a quartic in cos(x). As a polynomial in x, however, it's only a polynomial if you allow polynomials of infinite degree.

 

[stevenb]

And so, the OP gets a free answer with no attempt at the solution and no indication that he even understands the question.

 

[Char. Limit]

And so, the OP gets a free answer with no attempt at the solution and no indication that he even understands the question.

Agh, my bad my bad. Think I should delete or has he already seen it?

 

[stevenb]

Agh, my bad my bad. Think I should delete or has he already seen it?

Well, it happened on your 1000th post, so you earned a get out of jail free card, and we have to let it go.

 

[zeion]

I already saw it HAHAHA