+0  
 
0
149
1
avatar+89 

8cos^2θ – 10cosθ – 7 = 0

 Nov 24, 2021
 #1
avatar+117437 
+1

let x= cosθ 

solve it as a quadratic.  (for x)

 

then sove for theta. 

 Nov 24, 2021

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