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1. Simplify the following expressions: (a) arccosh (cosh r) for r 1. Simplify the following expressions: (a) arccosh(cosh x) for x < O. (b) sech(arcsinh

1. Simplify the following expressions: (a) arccosh (cosh r) for r

1. Simplify the following expressions: (a) arccosh(cosh x) for x < O. (b) sech(arcsinh x) for x e IR.

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