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3
avatar+145 

I got theta = 5pi/6

 

Is that correct?

 Jun 17, 2021
edited by mnkmnk  Jun 17, 2021
 #1
avatar+120930 
+2

y  =  [ -sqrt (3)  / 3 [  x

 

y / x  =   -sqrt (3)  /3

 

tan θ   =  -sqrt (3)  / 3  =   - 1 /sqrt (3)

 

arctan (-1/sqrt 3)    = -30°  

 

Add  180 to this

 

θ  = 150°   =    5pi/ 6       good job  !!!!

 

 

cool cool cool

 Jun 17, 2021
 #2
avatar+145 
0

Thank you so much!

mnkmnk  Jun 17, 2021
 #3
avatar+120930 
+1

No prob   !!!!!

 

 

cool cool cool

CPhill  Jun 17, 2021

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