Smallest Positive Coterminal Angle for 57pi/20

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Which of the functions below could have created this graph?

Alina fully simplifies this polynomial and then writes it in standard form. xy2 – 2x2y + 3y3 – 6x2y + 4xy2 if alina wrote the last term as 3y3, which must be the first term of her polynomial in standard form? xy2 5xy2 –8x2y –2x2y