# find value of inverse trig ratios

• January 26th 2009, 12:44 PM
j0nath0n3
find value of inverse trig ratios
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?
• January 26th 2009, 01:04 PM
anywho
arc tan undefined - Where is tangent undefined? That will be your answer. Tangent is undefined at $\frac{\pi}{2} and \frac{3\pi}{2}$

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.