Cos^2-9cosx-1=0

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Solution for Cos^2-9cosx-1=0 equation:


Simplifying
Cos2 + -9cosx + -1 = 0

Reorder the terms:
-1 + -9cosx + os2C = 0

Solving
-1 + -9cosx + os2C = 0

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 + -9cosx + 1 + os2C = 0 + 1

Reorder the terms:
-1 + 1 + -9cosx + os2C = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -9cosx + os2C = 0 + 1
-9cosx + os2C = 0 + 1

Combine like terms: 0 + 1 = 1
-9cosx + os2C = 1

Add '-1os2C' to each side of the equation.
-9cosx + os2C + -1os2C = 1 + -1os2C

Combine like terms: os2C + -1os2C = 0
-9cosx + 0 = 1 + -1os2C
-9cosx = 1 + -1os2C

Divide each side by '-9osx'.
c = -0.1111111111o-1s-1x-1 + 0.1111111111sx-1C

Simplifying
c = -0.1111111111o-1s-1x-1 + 0.1111111111sx-1C

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