How do I write a mathematical equation for ARIMA(1,0,0)(1,1,0)[12] and How to substitute values of coefficients in that formula. Please help [duplicate]

Question

How do I write a mathematical equation for ARIMA(1,0,0)(1,1,0)[12] and How to substitute values of coefficients in that formula.
My model is

ARIMA(1,0,0)(1,1,0)[12]
## ARIMA(1,0,0)(1,1,0)[12] 
## 
## Coefficients:
##          ar1     sar1
##       0.6606  -0.5763
## s.e.  0.1143   0.1295