cos(x)=80

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Solution for cos(x)=80 equation: 


Simplifying
cos(x) = 80

Multiply cos * x
cosx = 80

Solving
cosx = 80

Solving for variable 'c'.

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

Divide each side by 'osx'.
c = 80o-1s-1x-1

Simplifying
c = 80o-1s-1x-1

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