Quèstion 4 cosh (T-i) = e cosl + i e sin 1 e cos 1 + ie TI sin 1 2 e cosl - i e™ sin 1 + e cos 1 i e sin 1 e cosl - i e sin 1 + e cos 1 + i e sin 1 e cosl ie sin 1 + e cos 1 + i e-" sin 1

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