Thread: a kind of trigonometry proving.

greet guys, (hyperbolic not trigonometry)

since sinh-1 (x) = ln(x + surd(x^2 +1) )
cosh-1 (x) = ln(x + surd(x^2 -1) )

therefore, prove that sinh-1 (x) = (cosh-1(surd(x^2 +1))

anyone please..

Originally Posted by vocyber

greet guys, (hyperbolic not trigonometry)

since sinh-1 (x) = ln(x + surd(x^2 +1) )
cosh-1 (x) = ln(x + surd(x^2 -1) )

therefore, prove that sinh-1 (x) = (cosh-1(x))(surd(x^2 +1))

anyone please..

this isn't true. make sure you posted the right problem.