Radian & Degree Measures

[nycmathguy]

What does the upside-down exclamation point mean in this example for (a) and (b)?

 

[MathLover1]

that should be sign for "degree", it must be some error or wrong code usage

 

[nycmathguy]

that should be sign for "degree", it must be some error or wrong code usage

Ok. Thanks. How have you been?

 

[MathLover1]

Fine, thank you.

 

[nycmathguy]

Fine, thank you.

Good to know.