Is it possible to rewrite cos(x^2) as a number without trigonometric functions of non-linear variabl

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Millenniums

If you would test the equation why don't you try it with the real number for x variable.

Millenniums

Another possible solution is converting the left side and the right side of the equation into the equivalence series of them. By comparing the left side series with the right side series, there would be a chance to measure their equivalencies.