SOLUTION: Ok, so I have my Honors Algebra 2 FINAL tomorrow and there is this certain type of problem I just don't understand. No matter how many times I try these types of problems I just ca

Question 123996: Ok, so I have my Honors Algebra 2 FINAL tomorrow and there is this certain type of problem I just don't understand. No matter how many times I try these types of problems I just can't seem to get them right. Could someone maybe explain to me how to do the following type of problem? That would be a huge help. I'm hoping that maybe a second explanation other than the one from my teacher will help me finally understand.
You could use this problem as an example.
Directions: Solve each equation for

Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Try this:
(I hope I got this right): Subtract from both sides.
Now divide both sides by -6.

Now you are looking for the angle theta whose cosine is or:
or

degrees.
In radians: Radians.
Check:(Degrees)
Substitute

Check: (Radians)
Substitute

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