4cosx=-1

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Solution for 4cosx=-1 equation: 


Simplifying
4cosx = -1

Solving
4cosx = -1

Solving for variable 'c'.

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

Divide each side by '4osx'.
c = -0.25o-1s-1x-1

Simplifying
c = -0.25o-1s-1x-1

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