Go language: Discrete sine transform and discrete cosine transform and inverse transformation

FUNC&NBSP;DST (In []float64)  []float64 {    out := make ([]float64,  len (in))     nr := len (in)     for i := 0 ;  i < nr; i++ {        for j :=  0; j < nr; j++ {             tmp :=  (Float64 (i)  + 0.5)  *  (Float64 (j)  + 0.5)  /  float64 (NR)             out[i] +=  In[j] * math. Sin (Tmp*math. Pi)         }    }    return &NBSP;OUT}FUNC&NBSP;IDST (In []float64) &NBSP;[]FLOAT64&NBSP;{&NBSP;&NBSP;&NBSP;&NBSP;OUT&NBSP;:=&NBSP;DST ( IN) &NBSP;&NBSP;&NBSP;&NBSP;FOR&NBSP;I,&NBSP;V&NBSP;:=&NBSP;RANGE&NBSP;OUT&NBSP;{&NBSP;&NBSP;&NBsp;     out[i] = v * 2 / float64 (Len (in))    &NBSP;&NBSP;}&NBSP;&NBSP;&NBSP;&NBSP;RETURN&NBSP;OUT}FUNC&NBSP;DCT (In []float64)  []float64 {     out := make ([]float64, len (in))     nr :=  Len (in)     for i := 0; i < nr; i++ {         for j := 0; j < nr; j++ {             tmp := float64 (i)  *   (Float64 (j)  + 0.5)  / float64 (NR)              out[i] += in[j] * math. Cos (Tmp*math. Pi)         }    }    return &NBSP;OUT}FUNC&NBSP;IDCT (In []float64) &NBSP;[]FLOAT64&NBsp {    out := make ([]float64, len (in))     nr :=  len (in)     for i := 0; i < nr; i++ {         out[i] = in[i] / 2         for j := 0; j < nr; j++ {             tmp := float64 (j)  *  (Float64 (i)  + 0.5)  / float64 (NR)              out[i] += in[j] * math. Cos (Tmp*math. Pi)         }        out[i]  = out[i] * 2 / float64 (NR)     }     Return out}

Go language: Discrete sine transform and discrete cosine transform and inverse transformation