The equation $\displaystyle 2-cos^2\theta=Acos2\theta$ where $\displaystyle A$ is a constant, has a root $\displaystyle \theta=30^o$. Find all the other roots such that $\displaystyle \theta$ is between $\displaystyle 0^o$ and $\displaystyle 360^o$
The equation $\displaystyle 2-cos^2\theta=Acos2\theta$ where $\displaystyle A$ is a constant, has a root $\displaystyle \theta=30^o$. Find all the other roots such that $\displaystyle \theta$ is between $\displaystyle 0^o$ and $\displaystyle 360^o$
It seems like you are unsure how to solve s trigonometric equation. Review your class notes which should have covered that to get some basic understanding on this before you get back to this question.
Anyways, in case if it's the square of the cosine which is confusing you,
$\displaystyle \cos b =\pm \sqrt{\frac{A+2}{2A+1}}$