Lee is comparing brands of juice. Brand A
costs $4.95 for 3 bottles and each bottle
contai...
Mathematics, 31.03.2020 03:25, JANA279
Lee is comparing brands of juice. Brand A
costs $4.95 for 3 bottles and each bottle
contains 0.95 liter. Brand B costs $5.19
for 5 bottles and each bottle contains
0.55 liter. Which has more juice: 3 bottles
of Brand A or 5 bottles of Brand B?
Answers: 1
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Prove (a) cosh2(x) ā sinh2(x) = 1 and (b) 1 ā tanh 2(x) = sech 2(x). solution (a) cosh2(x) ā sinh2(x) = ex + eāx 2 2 ā 2 = e2x + 2 + eā2x 4 ā = 4 = . (b) we start with the identity proved in part (a): cosh2(x) ā sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 ā sinh2(x) cosh2(x) = 1 or 1 ā tanh 2(x) = .
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