Question

Is there a way to calculate this question using a scientific calculator?

Answer 1

For this case we know that:

`\sec \theta=2`

Using the definition of sec we have this:

`(1)/(\cos \theta)=2`

Then solving for cos we got:

`\cos \theta=(1)/(2)`

Then the angle is :

`\theta=arc\cos ((1)/(2))=(\pi)/(3),-(\pi)/(3)`

Then the answer is:

pi/3, -pi/3