fix printer reduced form order

src/utils/math.c

@@ -16,6 +16,21 @@ bool is_nearly_equal_zero(double num)
     return true;
 }
 
+const s_polynom *get_term_of_power(const s_polynom *polynom, int power)
+{
+    int i;
+
+    i = 0;
+    while (polynom[i].sign != TERM_SIGN_END)
+    {
+        if (polynom[i].exponent == power)
+            break;
+        i++;
+    }
+
+    return &polynom[i];
+}
+
 bool has_decimal_part(double num)
 {
     return (!is_nearly_equal(num, (int)num));