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Mathematics, 16.12.2019 15:31 venom1577
Corri received money for her birthday. she let lakisha borrow $4.50 and spent half of the remaining money. the next day she received $10 from her uncle. after spending $12.50 at the movies, she still had $7.75 left. how much money did she receive for her birthday?
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Prove (a) cosh2(x) β sinh2(x) = 1 and (b) 1 β tanh 2(x) = sech 2(x). solution (a) cosh2(x) β sinh2(x) = ex + eβx 2 2 β 2 = e2x + 2 + eβ2x 4 β = 4 = . (b) we start with the identity proved in part (a): cosh2(x) β sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 β sinh2(x) cosh2(x) = 1 or 1 β tanh 2(x) = .
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Corri received money for her birthday. she let lakisha borrow $4.50 and spent half of the remaining...
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