3. Numerical coefficient of x² in= x++5xy is a) 5 b) - 5/2 c) 5/2 d) 1/2
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What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

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) = .

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5