cos(2pix)=0.9

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Solution for cos(2pix)=0.9 equation: 


Simplifying
cos(2pix) = 0.9

Remove parenthesis around (2ipx)
cos * 2ipx = 0.9

Reorder the terms for easier multiplication:
2cos * ipx = 0.9

Multiply cos * ipx
2ciopsx = 0.9

Solving
2ciopsx = 0.9

Solving for variable 'c'.

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

Divide each side by '2iopsx'.
c = 0.45i-1o-1p-1s-1x-1

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

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