my question asked me to prove that
i proved already and then the next part asked me to substitute to find the roots of the eqn
i dont know what is point of substituting it. i thought i can just find the roots by keying the eqn into my calculator. can people pls teach me how to find the roots of the eqn without using the calculator?
I'm assuming that these were two of the angles you found:
(Sorry that I'm mixing degrees and radians here.) To find the remaining angles, you'll have to add 360 degrees, then 720 degrees to each of the angles above, before dividing by 3. That way, you'll find all values of theta between 0 and 360 degrees. So the third angle is:
The sixth and final angle should be:
Now plug in each angle into , and as I said before, you'll only get three different values.