help w/ mult-angle equation: cos(arccos x - arctan x)

[WRbob]

Could anyone help me with the problem cos(arccos x - arctan x)?

 

[WRbob]

Re: help with mult-angle equation

OK, I think I found the answer. The answer I got was was 3x/1-x. Could anyone please check me on this?

 

[stapel]

Could anyone help me with the problem cos(arccos x - arctan x)?

Your subject line refers to an "equation", but the above is an expression...? Also, there are no instructions...?

Please reply with clarification, including a clear listing of everything you have tried so far. Thank you!

Eliz.

 

[Deleted member 4993]

Re: help with mult-angle equation

OK, I think I found the answer. The answer I got was was 3x/1-x. Could anyone please check me on this?

Assuming you wanted to evaluate

cos(arccos x - arctan x)

It cannot equal to 3x/(1-x) [assuming this is what you meant].

x = 1/2 makes the expression greater than '1'.