Applied Maths Solutions | Fundamental

Errors are independent and normally distributed (for justification of least squares).

Residuals: ( 2.1 - (1.233+1.35)= -0.483 ); ( 3.9 - (1.233+2.70)= -0.033 ); ( 5.8 - (1.233+4.05)= 0.517 ). Sum of residuals ≈ 0 (rounding). ✔

Fourier series coefficients ( a_n, b_n ).