Function cothd

pub fn cothd(degrees: FLOAT) -> FLOAT

Returns the hyperbolic cotangent of the argument given in degrees

assert_approx_eq(cothd(1.0), coshd(1.0)/sinhd(1.0), 1e-10);

assert_approx_eq(cothd(0.5), coshd(0.5)/sinhd(0.5), 1e-10);

assert_approx_eq(cothd(0.1), coshd(0.1)/sinhd(0.1), 1e-10);