clausen 1.0.1

Rust implementation of Clausen functions.
Documentation 
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pub fn sl9(x: f64) -> f64 {
    let pi = core::f64::consts::PI;
    let pi2 = pi*pi;
    let pi4 = pi2*pi2;
    let pi6 = pi4*pi2;
    let pi8 = pi4*pi4;
    let x2 = x*x;
    x*(pi8/9450.0 + x2*(-1.0/5670.0*pi6 + x2*(pi4/10800.0 + x2*(-1.0/30240.0*pi2 + (pi/80640.0 - 1.0/725760.0*x)*x))))
}