cosx=-0.7

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Solution for cosx=-0.7 equation: 


Simplifying
cosx = -0.7

Solving
cosx = -0.7

Solving for variable 'c'.

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

Divide each side by 'osx'.
c = -0.7o-1s-1x-1

Simplifying
c = -0.7o-1s-1x-1

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