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Fixes #44
The
tanhfunction was computingsinh(a) / cosh(a), which for large inputs was performing anInfinity / Infinity. This PR rewrites the function to usetanh(a)directly, avoiding that division.I added an extra test to the suite to verify that the results are correct. In doing so, I realised that it also improved the numerical accuracy of the test computing
tanh(1 + 3i), so I had to update it accordingly.