3. Geometry and Trigonometry

Double Angle Formulae — Quiz

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

Practice Questions

Question 1

Which double angle identity is correct for $\sin(2\theta)$?

Question 2

Which double angle identity is correct for $\cos(2\theta)$?

Question 3

If $\sin\theta=\frac{3}{5}$ and $\theta$ is in quadrant $1$, what is $\sin(2\theta)$?

Question 4

Which expression is equivalent to $\cos(2\theta)$?

Question 5

What is the value of $\cos(2\cdot 30^\circ)$?