4. Error Analysis Martin says that f(x) = 2(4)* starts at 4 and has constant ratio of 2. What error did Martin make? Explain.

Asquare parking lot has 6,400 square meters what is the length in meters

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

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) = .