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

Coshti Dowden has: Played Simon in "Grange Hill" in 1978. Played Darren in "The Bill" in 1984. Played Colin Mayhew in "The Bill" in 1984. Played Cosh in "Sister Said" in 1998. Played Cosh in "Harry and Cosh" in 1999. Played Isaiah in "Hush Your Mouth" in 2007.

John Cosh died in 2005.

John Cosh was born in 1915.

Cosh Boy was created in 1953.