N is the number of new cars sold in a given month and t the number of years since January 2000.

N=a+at+ a2 cos 2nt + a3 sin 2xt where N is the number of new cars sold in a given month and t the number of years since January 2000. Use 16 digits in your calculations and give the answers with at least 2 decimals after the comma ap a1 a2 11 11 II a3 = The root mean square error RMSE is V