arc tan undefined
arc sin 1/2
cos (to the power of -1) - square root of 3 over 2
cos(arc tan 5/13)
Can anyone guide me through these?
arc tan undefined - Where is tangent undefined? That will be your answer. Tangent is undefined at $\displaystyle \frac{\pi}{2} and \frac{3\pi}{2}$
The other problems can be done by basically working backwards or plugging them into your calculator. If that does not help then I can do a couple more or someone else can.