SOLUTION: Find all solutions to the equation. Cos^2 x+2 cos x+1=0

Algebra ->  Trigonometry-basics -> SOLUTION: Find all solutions to the equation. Cos^2 x+2 cos x+1=0      Log On


   

Question 937475: Find all solutions to the equation.
Cos^2 x+2 cos x+1=0
Answer by josgarithmetic(39625) About Me  (Show Source):