Sin^2 2x + sin^2 4x - sin^2 6x

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Twelve less than a number is at most 20

The table below lists recommended amounts of food to order for 10 party guests. how much of each food item should nathan and amanda order for a graduation party with 55 guests? use the table to answer. item amount fried chicken 16 pieces lasagna 7 pounds deli meats 1.8 pounds sliced cheese 1 and two fifths pounds bakery buns 1 dozen potato salad 2 pounds