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a submarine is 671 feet below sea level. if it ascends 218 feet and then descends 1363 fee...
Mathematics, 16.10.2019 18:30 AWFHayami
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a submarine is 671 feet below sea level. if it ascends 218 feet and then descends 1363 feet, what is its new position?
a) 474 feet below sea level
b) 1,363 feet below sea level
c) 1,816 feet below sea level
d) 2,252 feet below sea level
Answers: 1
Mathematics, 21.06.2019 16:30
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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) = .
Answers: 3
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