The Double Angle Formula


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question 1 of 3

Which of the following is equal to sin(2x)?

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1. Which of the following is equal to cos(2x)?

2. Which of the following is equal to tan(2x)?

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About This Quiz & Worksheet

The values of trigonometric functions are not just doubled when the value of x doubles. This quiz and corresponding worksheet will assess your knowledge of the formulas for finding sin, cos, or tan of (2x) and how to use them.

Quiz & Worksheet Goals

In this assessment you will be required to use your skills to:

  • Identify the sine, cosine, and tangent double angle formulas
  • Solve practice problems to find the value of cos(2x), sin(2x), or tan(2x)

Skills Practiced

  • Problem solving - use acquired knowledge to solve double angle trigonometric practice problems
  • Information recall - access the knowledge you've gained regarding the double angle formulas for sine, cosine, and tangent
  • Making connections - use understanding of the double angle formulas to find the value of a given trigonometric function when you have the value of another and a range for the value of x

Additional Learning

For more information on the double angle formula, see the accompanying lesson by the same name. This lesson includes:

  • Why the double angle formulas are necessary
  • The formula for finding sin(2x)
  • The formula for finding cos(2x)
  • The formula for finding tan(2x)
  • Examples of how to solve double angle formula problems