2cos^2(x)+9cos(x)=0

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Solution for 2cos^2(x)+9cos(x)=0 equation:


Simplifying
2cos2(x) + 9cos(x) = 0

Multiply cos2 * x
2cos2x + 9cos(x) = 0

Multiply cos * x
2cos2x + 9cosx = 0

Reorder the terms:
9cosx + 2cos2x = 0

Solving
9cosx + 2cos2x = 0

Solving for variable 'c'.

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

Factor out the Greatest Common Factor (GCF), 'cosx'.
cosx(9 + 2s) = 0

Subproblem 1

Set the factor 'cosx' equal to zero and attempt to solve: Simplifying cosx = 0 Solving cosx = 0 Move all terms containing c to the left, all other terms to the right. Simplifying cosx = 0 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(9 + 2s)' equal to zero and attempt to solve: Simplifying 9 + 2s = 0 Solving 9 + 2s = 0 Move all terms containing c to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2s = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 2s = 0 + -9 2s = 0 + -9 Combine like terms: 0 + -9 = -9 2s = -9 Add '-2s' to each side of the equation. 2s + -2s = -9 + -2s Combine like terms: 2s + -2s = 0 0 = -9 + -2s Simplifying 0 = -9 + -2s The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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