9cos(2x)-5=0

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Solution for 9cos(2x)-5=0 equation:


Simplifying
9cos(2x) + -5 = 0

Remove parenthesis around (2x)
9cos * 2x + -5 = 0

Reorder the terms for easier multiplication:
9 * 2cos * x + -5 = 0

Multiply 9 * 2
18cos * x + -5 = 0

Multiply cos * x
18cosx + -5 = 0

Reorder the terms:
-5 + 18cosx = 0

Solving
-5 + 18cosx = 0

Solving for variable 'c'.

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

Add '5' to each side of the equation.
-5 + 5 + 18cosx = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 18cosx = 0 + 5
18cosx = 0 + 5

Combine like terms: 0 + 5 = 5
18cosx = 5

Divide each side by '18osx'.
c = 0.2777777778o-1s-1x-1

Simplifying
c = 0.2777777778o-1s-1x-1

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