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Answer by sergiokapone for Evaluating a result in \foreach
The error occurs because acrsine does not exist for angles greater than 90. After limiting refraction, total internal reflection occurs. Therefore, it is no longer possible to calculate the angle of...
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I'm trying to animate total reflection.. so I need to evaluate the second angle inside the \foreach loop, I tried \pgfmathparse{asin(1.33*sin(deg(\th))}, but I got the error !missing number, treated as...
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