Pre-calc

To solve this, you would useually simply use the inverse of the cosine function. (cos^-1(2.29) = x). However, this is not a real answer.

Yeah, that's the problem I'm having. I'll re-check my equation and see if I set it up right.

Thanks for the help. I made a mistake in the addition earlier in the equation. I am soo stupid....

2.29=cos(x)

Hi Special,
The cos of an angle has to be between -1 and 1
so next time you should see straight away that the question is not correct.

Thanks, Melody! I'll remember that.

It is probably more important that you remember why!

Remember

cosine is adjacent / hyptotenuse

sine is opposite over hypotenuse

The hyptoenuse HAS to be the longest side so sine and cosine have to be between 0 and 1 (for first quadrant)
In the other quadrants only the sign changes.

So sine and cos have to be between -1 and 1.

Hope that helps Special.

It is probably more important that you remember why!

Remember

cosine is adjacent / hyptotenuse

sine is opposite over hypotenuse

The hyptoenuse HAS to be the longest side so sine and cosine have to be between 0 and 1 (for first quadrant)
In the other quadrants only the sign changes.

So sine and cos have to be between -1 and 1.

Hope that helps Special.

Thank you, Melody! That makes a lot of sense. Now I know how I got all those other problems wrongs. *facepalm* I'll have to remember that from now on. ^_^