# Posts by Thales

Total # Posts: 2

**Math**

4 3 1 1 2 1 -2 -3 What's the pattern and the next numbers of this sequence?

**math**

We know that cos^2(theta) + sin^2(theta) = 1. So, using that, 2 + cos^2(theta)=3sin^2(theta) 2 + cos^2(theta)=3(1 - cos^2(theta)) 2 + cos^2(theta)=3 - 3cos^2(theta)) 4cos^2(theta)= 1 cos^2 (theta)=1/4 cos (theta)=+-(1/4)^1/2 theta = arccos(1/2) or theta = arccos(-1/2) theta = ...