In this video I go over a very quick hyperbolic trig identity proof of the identity 1-tanh²(x) = sech²(x) using the hyperbola identity, cosh²(x) - sinh²(x) = 1, which I proved in my earlier video.

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Derivatives of Hyperbolic Functions Proof: 1 – tanh²(x) = sech²(x)

1 – tanh² (x) = sech²(x)