2cosx=-0.9

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Solution for 2cosx=-0.9 equation: 


Simplifying
2cosx = -0.9

Solving
2cosx = -0.9

Solving for variable 'c'.

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

Divide each side by '2osx'.
c = -0.45o-1s-1x-1

Simplifying
c = -0.45o-1s-1x-1

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