Cos^2(X)-8cosx-1=0

Solution for Cos^2(X)-8cosx-1=0 equation:

Simplifying
Cos2(X) + -8cosx + -1 = 0

Multiply os2C * X
os2CX + -8cosx + -1 = 0

Reorder the terms:
-1 + -8cosx + os2CX = 0

Solving
-1 + -8cosx + os2CX = 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 + -8cosx + 1 + os2CX = 0 + 1

Reorder the terms:
-1 + 1 + -8cosx + os2CX = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -8cosx + os2CX = 0 + 1
-8cosx + os2CX = 0 + 1

Combine like terms: 0 + 1 = 1
-8cosx + os2CX = 1

Add '-1os2CX' to each side of the equation.
-8cosx + os2CX + -1os2CX = 1 + -1os2CX

Combine like terms: os2CX + -1os2CX = 0
-8cosx + 0 = 1 + -1os2CX
-8cosx = 1 + -1os2CX

Divide each side by '-8osx'.
c = -0.125o-1s-1x-1 + 0.125sx-1CX

Simplifying
c = -0.125o-1s-1x-1 + 0.125sx-1CX