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ove the identity 1 tanh x e2x 1 tanh x 1 tanh x 1 tanh x 1 cosh x cosh x cosh x e x
ove the identity 1 tanh x e2x 1 tanh x 1 tanh x 1 tanh x 1 cosh x cosh x cosh x e x cosh x 0 ex e x ex e x
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