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Mathematics, 16.10.2020 03:01 Eddie997
A cell phone company charges $49.95 per month plus $0.05 per call minute. I used 200 call minutes last month. Proportional or not proportional.
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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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A cell phone company charges $49.95 per month plus $0.05 per call minute. I used 200 call minutes la...
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