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: Recognize a statistical question as one that anticipates variability in the data related to the question and accounts for it in the answers. For example, “How old am I?” is not a statistical question, but “How old are the students in my school?” is a statistical question because one anticipates variability in students’ ages.
problem_activity: Problem 1
Two similar situations are shown below. How are they similar and how are they different?
A pair of sneakers regularly cost $40. They are on sale for 25% off. How much money will you save?
A pair of boots are on sale for $40 off. This is a savings of 25%. What is the regular price of the boots?
Problem 2
The Alden Middle School has a girls’ soccer team and a boys’ soccer team.
The girls’ soccer team won 80% of its games this season. They won 12 games.
The boys’ soccer team won 70% of its games this season. They won 14 games.
How many games did each soccer team play this season?
Problem 3
You’ve poured 84 gallons of water from a hose into a small pool. The pool is 35% filled with water. How many gallons of water can the pool hold if it is completely filled?


aligns: no