+9479 Click the " 2nd " button in the top left.
Click " atan ".
Click the " 2nd " button again.
Type the number that you want to get the inverse tangent of.
Close the parenthese, just because it's good to.
Click " = "
Or you can just type in " atan( ".
+37146 If you hit the ' 2nd' button the 'tan' key will become 'atan' which is tan^-1
