Question

If cos s = 1/2 and s is not in quadrant 1, what is the value of s for the angle with cos s = 1/2 ?

Answer 1

Using All Students Take Calculus, you can deduce in which quadrant the angle must lie for it to be positive and not in Q1.

Answer 2

sorry, I'm like not very good when it comes to trig, but I know you're trying to help. I know like what sin cos and tan is, but how to I find where the answer lies in the quadrant ?

Answer 3

judging by the fact that cos is positive only in q1 and q4 then s is an angle for Q4

Answer 4

Are you aware of the special triangles?

Answer 5

yes, equilateral, isosceles, and there was like maybe a couple more I forget

Answer 6

In trig, the special triangles are 30-60-90 and 45-45-90 triangles, where the numbers are the measures of the interior angles.

http://ededu.net/Main/Math/175precal/175Ch4/specRtTringls.html

You will need to memorize these in order to succeed in trig.

Answer 7

okay

Answer 8

You will see from the link that the cosine of pi/3 is 1/2. But obviously that lies in Q1. All you have to do now is find the angle in Q4 that has the same reference angle.

Answer 9

If you are not familiar with radian measure, that is 60 deg in degrees. You will soon learn of radian measure if this is the case because it used FAR more than degrees.

Answer 10

thanks ... I'll look it over and see what I get.