pub fn cot(radians: FLOAT) -> FLOAT
Returns the cotangent of the argument given in radians
assert_approx_eq(cot(pi/4), 1.0, 1e-10);
assert_approx_eq(cot(pi/2), 0.0, 1e-10);
assert_approx_eq(cot(3*pi/4), -1.0, 1e-10);