document.write( "Question 865563: Solve the equation on the interval 0\n" ); document.write( "
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Algebra.Com's Answer #521754 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "Cos^2 (x) + 2cos(x) + 1= 0 
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document.write( "let X  = cos(x)
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document.write( "X^2 + 2X + 1 = 0, X = -1
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document.write( "COS(x) = -1 , x = 180° or any angle 180°  (0 ≤ x ≤ 2pi) \n" );
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