Find the circumference given the diameter.
d= 9 cm
C = id
C 3.14 •
cm to
C__?__
The circumference is_?__
the nearest tenth of a centimetre.

Issof claims that the scale factor is 1/2. which statement about his claim is correct

Math each whole number with a rational,exponential expression

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) = .