How does my Calculus textbook get this trigonometry answer?

Tom

New member
sec(theta) = 2

theta = pi/3, 5pi/3

I get that the coordinates for 1/2, sqrt(3)/2 for cos and sin respectively but I don't understand what to do after I get those coordinates. Any help appreciated!
No, I am not given what theta equals at any point, I'm stuck getting to the textbook's answer.
 
Back
Top