Question 4
Given f (20) = 5, find x if f(x) = -3x β 4
-3
-19
O 11
O 12...
Mathematics, 28.11.2020 21:40 ryliefitz32
Question 4
Given f (20) = 5, find x if f(x) = -3x β 4
-3
-19
O 11
O 12
help
Answers: 3
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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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