Detailed Instructions: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Problem:[header] How to derive the cosine difference formula [title] Draw your unit circle and label as needed. [title] Label the origin as point z with the ordered pair (0 , 0). [title] Label 0 degrees as point y with the ordered pair (1 , 0). <sep> (A) [title] Name the cosine equation scientifically integrated into the formula, and use the other cells along with the line to determine how much distance is divided. [title] Color the cosine equation in 360 c/180 f (= k420). (B) [title] Draw a special angle from the unit circle and label it angle a. [step] This gives us point x, which has the ordered pair (cosa, sina). (C) [step] Find your first container and label the radius-1 , 0.45. Most users use the amount of space in the compass to put the levout of the more circle diameter of the levout. (D) [step] The number x i from the atomic number is the sum of degrees. [title] Add this factor to your total number by adding an axis that is smaller than pi.
Solution:
B