# Thread: An Equation to Solve

1. ## An Equation to Solve

I'm trying to solve $a\left(\cos^{2}{\theta} - \sin^{2}{\theta}\right) + h\left(\cos{\theta} - \sin{\theta}\right) = 0$ for $\theta$ where $0 \le \theta \le \frac{\pi}{2}$, but I can't see the best approach. Any thoughts?

3. ## Re: An Equation to Solve

Doh! How did I miss that?