standard_description: Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.
problem_activity: Draw a visual model to represent the solution to the division problem
$${6 \div \frac{2}{3}}$$
.
Then, use your model to explain why this can also be solved with the multiplication problem
$${6 \times \frac{3}{2}}$$
.


aligns: no