Please write the proportion fir then and i’ll solve it

How do i do this? i don’t understand

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

Answer asap. you begin with 1/2 scoop of ice cream. since you're hungry, you ask the vendor for 2/7 more scoops of ice cream. then, you eat 5/8 scoops. how many scoops of ice cream are left on your cone? i will mark brainliest for first correct answer.