Sinh x equals -3divide5 find cosh2x?

Answer 1

cosh^2 x - sinh^2 x = 1

cosh x = 1+ sinh^2 x

cosh x = 1+(-3/5)^2

cosh x = 1+9/25 = 34/25

cosh 2x = 2 sinh x cosh x

cosh 2x = 2 (-3/5) (34/25)

=-204/125