Thread: Help with problems involving trigonometric functions and terminal angles?

1. Help with problems involving trigonometric functions and terminal angles?

Hello everyone. I don't really know if this topic is suitable for this thread, but this is one of the topics being taught to us in Pre-Calculus class so I hope it's okay that I'm posting this here.

I'm confused with two particular questions in our worksheet. In the first one (#6, attached picture), our professor only taught us about getting the terminal points of a unit circle with the angles and everything given. In this one, it's asking us to find a possible terminal point for an unknown angle, so I don't really know what to do...

For the second one (#9, attached picture), I tried solving (a) but ended up getting stuck while solving for sec(1.45). My calculator keeps giving me the answer "math error".

Please guide me in the right direction. All help is very much appreciated. Thank you in advance!

2. Re: Help with problems involving trigonometric functions and terminal angles?

Originally Posted by kaonashi
Hello everyone. I don't really know if this topic is suitable for this thread, but this is one of the topics being taught to us in Pre-Calculus class so I hope it's okay that I'm posting this here.

I'm confused with two particular questions in our worksheet. In the first one (#6, attached picture), our professor only taught us about getting the terminal points of a unit circle with the angles and everything given. In this one, it's asking us to find a possible terminal point for an unknown angle, so I don't really know what to do...

For the second one (#9, attached picture), I tried solving (a) but ended up getting stuck while solving for sec(1.45). My calculator keeps giving me the answer "math error".

Please guide me in the right direction. All help is very much appreciated. Thank you in advance!
First: Put your calculator away and do mathematics.
Now then: $x^2=3^2+4^2$ so $x=5$. That means $\cos(\theta)=\dfrac{-3}{5}$
Thus $\sec(\theta)=~?$