cairo_fp - Cairo

cosh	Calculates hyperbolic cosine: cosh(a) = (e^a + e^-a) / 2
sinh	Calculates hyperbolic sine: sinh(a) = (e^a - e^-a) / 2
tanh	Calculates hyperbolic tangent: tanh(a) = sinh(a) / cosh(a)
acosh	Calculates inverse hyperbolic cosine: acosh(a) = ln(a + sqrt(a² - 1)) Requires a ≥ 1.
asinh	Calculates inverse hyperbolic sine: asinh(a) = ln(a + sqrt(a² + 1))
atanh	Calculates inverse hyperbolic tangent: atanh(a) = ln((1+a)/(1-a)) / 2 Requires -1 < a < 1.