Write an expression List the factors for the calculation of 4. double 2 and then TAWAR249

WANASWANAOWOHLAMAN

Complete the table. Kenneth bought a

shirt for $58.98. The Add 21 Add 4

sales tax was $3.54. 3 1 5

How much money did Kenneth spend on the shirt?

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) = .