Math Help Forum - View Single Post

alpina · #3 January 15th, 2009, 04:52 PM

Quote:

Originally Posted by vincisonfire

1. If the first identity is really $\frac{sin(sin^2(x))}{1-cos(x)}$ then I think that the statement is false. Take e.g. x=pi/4.
2. $tan(x) = -\frac{\sqrt{12}}{2}$ *use the operator arctan [/math]*tan^{-1} [/math]*
3. This is a quadratic equation. Let $*cos(x) = y$ *then the equation becomes $2y^2+y-1=0$ .*

thanks for your help