few_shots: 
Example:
Concept/skill: 
Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.

Problem/activity:
Find the general solution for:
$${\mathrm{cos}\left({\pi\over2}+x\right)=\mathrm{tan}{\pi\over4}}$$


Answer: 
Yes. An initial step when solving for x in this problem requires the use of the addition formula for cosine on the left side of the equation.

Now, determine whether the following problem or activity can enable students to understand the concepts or skills in the provided description.

shot_info: fl_problem_001894_pos_0

HS_0
standard_description: Apply and extend previous understandings of multiplication and division and of fractions to multiply and divide rational numbers.
problem_activity: Task
Lena paid \$18.96 for 3 pounds of coffee.
What is the cost per pound for this coffee?
How many pounds of coffee could she buy for \$1.00?
Draw a graph in the coordinate plane of the relationship between the number of pounds of coffee and the total cost.
In this situation, what is the meaning of the slope of the line you drew in part (c)?


aligns: no