added polynomials

gallery/example4.typ

@@ -0,0 +1,34 @@
+#import "/src/lib.typ": *
+
+#let p = poly.poly(0,1,2,3,4)
+#let q = poly.poly(5,6,7)
+
+#let a = poly.add(p, q)
+#let b = poly.sub(p, q)
+
+$
+  p = #poly.display(p) quad q = #poly.display(q)\
+  p + q = #poly.display(a)\
+  p - q = #poly.display(b)\
+$
+
+#let P = poly.poly(7, -3, -3, 1, 1)
+#let Q = poly.poly(-2, 1, 1)
+
+$
+  P = #poly.display(P) quad Q = #poly.display(Q)\
+  P / Q = #poly.display(P) / #poly.display(Q)
+$
+
+#let div = poly.div(P, Q)
+#align(center, grid(
+  columns: 2,
+  align: left,
+  column-gutter: 2em,
+  row-gutter: 1em,
+  [dividend: #poly.display(div.dividend)],
+  grid.cell(rowspan: 4, (div.display)()),
+  [divisor: #poly.display(div.divisor)],
+  [quotient: #poly.display(div.quotient)],
+  [rest: #poly.display(div.rest)],
+))