3 cot (2θ) + 3 = 0
Take 3 to the other side
3 cot (2θ) = -3
Divide both sides by 3
cot (2θ) = -3/3
cot (2θ) = -1
But cot = 1/ tan
1/ tan (2θ) = -1
Assume x = (2θ)
Then;
tan^-1 {-1 } = 2θ
-45 ° = 2θ
-22.5° = θ
-23° =θ
Answer
θ = -23°
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