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


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

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, assess whether the following problem or activity is 'aligned' with the given Common Core standard in Mathematics.

shot_info: fl_problem_001894_pos_0

HS_0
standard_description: Make a line plot to display a data set of measurements in fractions of a unit (1/2, 1/4, 1/8). Use operations on fractions for this grade to solve problems involving information presented in line plots. For example, given different measurements of liquid in identical beakers, find the amount of liquid each beaker would contain if the total amount in all the beakers were redistributed equally.
problem_activity: Task
Arianna has been saving her chore money all summer. Her mother has allowed her to
spend the money on school supplies of Arianna’s choosing. Here are some of her favorite
items and the price for each:
[IMG]
|  Lunchbox   | Art Supplies | Pencil Box | Mechanical Pencil |
|-------------|--------------|------------|-------------------|
| \$2 and 50¢ |     75¢      | $1 and 25¢ |        45¢        |
Arianna has four dollars and twenty-five cents to spend.
Select two items she might choose to purchase. What is the total cost of these two items?
Select three items she might choose to purchase. What is the total cost of these three items? How much money will Arianna have left over if she buys these three items
How many pencil boxes can Arianna buy without going over the $4 and 25¢ she has saved?
Explain your thinking for part (c) in words.


aligns: no