cos(2.5)=y

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Solution for cos(2.5)=y equation: 


Simplifying
cos(2.5) = y

Reorder the terms for easier multiplication:
2.5cos = y

Solving
2.5cos = y

Solving for variable 'c'.

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

Divide each side by '2.5os'.
c = 0.4o-1s-1y

Simplifying
c = 0.4o-1s-1y

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