A band expects to put songs on their next CD. The band writes and records ​% more songs than they expect to put on the CD. During the editing​ process, ​% of the songs are removed. How many songs will there be on the final​ CD?

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) = .

5x−4≥12 or 12x+5≤−4 can you with this problem

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