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: Use ratio and rate reasoning to solve real-world and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations.
problem_activity: Label the second quadrant on the coordinate plane, and then answer the following questions.
[IMG]
a.   Write the coordinates of one point that lies in the second quadrant of the coordinate plane.
b.    What must be true about the coordinates of any point that lies in the second quadrant?
c.    Plot and label the following points:
$${A: (-4, 6)}$$
$${B: (6, -4)}$$
$${C: (0, -2)}$$
$${D: (2, 0)}$$
$${E: (-5, -3)}$$


aligns: no