SineWMA = Sum / Weight

Sum= Price[i-N+1] * Sin(PI*(N)/(N+1)) + Price[i-N+2] * Sin(PI*(N-1)/(N+1)) + … + Price[i] * Sin(PI*1/(N+1))
Weight = Sin(PI*(N)/(N+1)) + Sin(PI*(N-1)/(N+1)) + … + Sin(PI*1/(N+1))