- Sinh=e^x - e^-x/2 tanh=e^x - e^-x/ e^x + e^-x find coshx please help!?

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I drank at the very beginning of the month, right after a blood test for Accutane. Will it be detected in my next test in around a week? What was the closing price of at&t stockon Dec, 31 1992? If 1.5 chickens can produce 1.5 eggs in 1.5 days, how many eggs can 3 chickens produce in 3 days? What is the element zinc, and what is the element gold too? Is it possible for a chemical reaction to happen instantly? In other words, is it possible for the time of a reaction be zero?