Question 1
Which of the following is an example of a double-angle identity for cosine?
Question 2
Which identity represents the relationship between sine and cosine of complementary angles?
Question 3
Which of the following is a correct identity for $\tan(2\theta)$?
Question 4
If $\cos(\alpha) = \frac{4}{5}$ and $\alpha$ is in the first quadrant, what is $\sin(2\alpha)$?
Question 5
Which identity is an example of a sum identity for cosine?
