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# How do you find all exact solutions on (0,2pi) of 2 cos^2(t)+3 cos(t)=-1 ?

## Question

###### How do you find all exact solutions on (0,2pi) of 2 cos^2(t)+3 cos(t)=-1 ?

$2 {\cos}^{2} \left(t\right) + 3 \cos \left(t\right) = - 1$

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