Mathematics, 24.02.2021 19:40 alecnewman2002
The cost of one CD and one DVD is $22. A DVD is $4 more expensive than a CD. Work out the individual prices of 1 CD and 1 DVD.
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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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The cost of one CD and one DVD is $22. A DVD is $4 more expensive than a CD. Work out the individual...
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