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tanhx = sinh x cosh x . tanhx = ex − e−x 2 ÷ ex + e−x 2 = ex − e−x ex + e−x . tanh 0 = sinh 0 cosh 0 = 0 1 = 0 . As x gets large, sinh x ≈ cosh x, so tanhx gets close to 1: tanh x ≈ 1 for large x.
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