I know the formula that I have to use. I know that since i have a value I can get the angle if I place that value in I can get the double angle. What is the point of the double angle? Why would I even look for this? Why do I need to be taught this?
I know the formula that I have to use. I know that since i have a value I can get the angle if I place that value in I can get the double angle. What is the point of the double angle? Why would I even look for this? Why do I need to be taught this?
HI
if you were to find cos 60 without using the calculator , how would you do this ?
Knowing the double angles would help a lot .
cos 60 = cos 2(30)
=2 cos^2 (30) -1
$\displaystyle =2(\frac{\sqrt{3}}{2})^2-1$ and go on .