How did you know it was 2/6 though?

Sketch one cycle if the cosine function y=2cos2theta

Find all the angles that satisfy the equation cos(θ)=32

Liang bought a basket of apples to make pies for her friends. the basket of apples weighed p pounds. before she had time to make the pies, she ate 3 pounds of apples. there are 17 pounds of apples left to make pies.