standard_description: Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.
problem_activity: Problem 1
Which expressions below are equivalent to 1? Select all that apply.
Problem 2
What is the value of
$$n$$
in the equation below? Explain your answer.
$${2^n\cdot{2^3\over{2^5}}=1}$$


aligns: no