3. Geometry and Trigonometry

Double Angle Formulae — Quiz

Test your understanding of double angle formulae with 5 practice questions.

Practice Questions

Question 1

What is the double angle formula for $\sin(2\theta)$?

Question 2

What is the double angle formula for $\cos(2\theta)$ in terms of $\sin\theta$ and $\cos\theta$?

Question 3

If $\sin\theta=\frac{3}{5}$ and $\theta$ is in quadrant I, what is $\cos(2\theta)$?

Question 4

If $\cos\theta=\frac{1}{3}$, what is $\cos(2\theta)$?

Question 5

Which identity is equivalent to $\sin(2\theta)$?