+0  
 
0
7
1
avatar+613 

Let \alpha be an angle in the third quadrant such that $\tan \alpha = \frac{1}{2}$.  Find $\cos \alpha.$

 Jan 1, 2025
 #1
avatar+130462 
+1

cos α =  -2 / sqrt [ 2^2 + 1^2]   =   -2 / sqrt 5

 

cool cool cool

 Jan 2, 2025

2 Online Users

avatar