Question

How do you use inverse trig functions to find angles?

Answer 1

1. Know that arccos, arcsec functions are restricted to quad 1 and 2
2. Know that arctan, arccot, arcsin, arccsc are restricted to quad 1 and 4
3. And when you go to quadrant 4 with arctan, arccot, arcsin, arccsc, use negative angles

Examples
1.`arcsin(1)= pi/2`
2. `arctan(-1)= -pi/4`
3. `arcsec(1/2)= DNE`
4. `arc csc (-sqrt2)= -pi/4`