A small plane taxis down a long runway and takes off. The plane gradually climbs to a certain altitude and flies for a time at that altitude. Then it gradually descends to a lower altitude and stays at that altitude. Sketch a graph that shows the altitude of the plane during this period of its flight.

Which ahows the graph of the solution set of 6x+4y< 12

If square root x = -7, then x= -49 true or false

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) = .