How to use the acos function from mathjs

ket.js

GitHub: sorin-bolos/schrodingers-cat

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sphereAngleCoordinates() {
    const polarA = this.amplitudes[0].toPolar();
    const polarB = this.amplitudes[1].toPolar();

    const aphi = polarB.phi - polarA.phi;
    const ateta = math.acos(polarA.r) * 2;
    const atetaB = math.asin(polarB.r) * 2;

    if (atetaB.toFixed(PRECISION) == ateta.toFixed(PRECISION))
    {

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api-controller.js

GitHub: Opportunity-Hack-San-Jose-2016/Repo-10

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}

function isWithinMiles(origin, other, dist_miles) {

        num =  math.cos( toRads(origin.lat) ) * math.cos( toRads( other.lat ) ) * math.cos( toRads( other.lng ) - toRads(origin.lng) ) + math.sin( toRads(origin.lat) ) * math.sin( toRads( other.lat ) )
        distance = ( 3959 * math.acos( num ) )

//      if(distance <= dist_miles){
//              console.log(other.lat + ', ' + other.lng)
//      }

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ImageSourceModel.js

GitHub: Billamw/Image-source-model

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//     let svec2 = math.subtract(plane2[1], plane2[0]);
//     let dvec2 = math.subtract(plane2[3], plane2[0]);
//     let nvec2 = math.cross(dvec2, svec2);


//     // Calculate the angle:
//     let angle = math.acos(math.multiply(nvec1, nvec2)/(math.norm(nvec1)*math.norm(nvec2)))


//     return angle;
// }

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+ 3 other calls in file