cos^2x-2cosx-1=O

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Solution for cos^2x-2cosx-1=O equation:


Simplifying
cos2x + -2cosx + -1 = O

Reorder the terms:
-1 + -2cosx + cos2x = O

Solving
-1 + -2cosx + cos2x = O

Solving for variable 'c'.

Move all terms containing c to the left, all other terms to the right.

Add '1' to each side of the equation.
-1 + -2cosx + 1 + cos2x = 1 + O

Reorder the terms:
-1 + 1 + -2cosx + cos2x = 1 + O

Combine like terms: -1 + 1 = 0
0 + -2cosx + cos2x = 1 + O
-2cosx + cos2x = 1 + O

Reorder the terms:
-1 + -1O + -2cosx + cos2x = 1 + O + -1 + -1O

Reorder the terms:
-1 + -1O + -2cosx + cos2x = 1 + -1 + O + -1O

Combine like terms: 1 + -1 = 0
-1 + -1O + -2cosx + cos2x = 0 + O + -1O
-1 + -1O + -2cosx + cos2x = O + -1O

Combine like terms: O + -1O = 0
-1 + -1O + -2cosx + cos2x = 0

The solution to this equation could not be determined.

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