Which set of ordered pairs represents y as a function of x? O {(3, 3), (3, 4), (4,3), (4,4)}
O {(2,-1), (4,-2), (6,-3), (8,4)}
O {(0,0), (1, 1), (1,0), (2, 1)}
O {(1,-5),(1,5), (2, -10), (2, -15)}

List the sides of δrst in ascending order (shortest to longest) if: m∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12

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) = .

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5