thanx.
Is there any goog tuts for learning trigonometry on my own? My textbook is terrible, it starts with hard things soon as explanations part is over. I need something that begins with easier things (but not too easy). I also need good reference for line (Ax+By+C=0) and circle ((x - a) ^2 +...
Homework Statement
I can't find way to solve \frac{Sin25 * Sin65}{Cos 40}
Homework Equations
The Attempt at a Solution
I looked trough allformulas i have I came up with:
\frac{Sin25 * Sin65}{Cos 40} = \frac{Sin25 * Cos25}{Cos 40}
But then found that formula is:
Sin 2a =2{Sina * Cosa}
Which...