Mathematics, 02.08.2019 17:00 poniatowski23
Ameal at a restaurant costs $20. the tax is 7.5%, and you need to leave 15% of the cost before taxes as tip. what is the total cost of the meal?
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Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .
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Ameal at a restaurant costs $20. the tax is 7.5%, and you need to leave 15% of the cost before taxes...
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