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Cos 2 Theta

deg

Result

cos(2θ)0.5
↗ Math

Cos 2 Theta — free online calculator.

Formula

cos(2θ) = cos(2 × Theta (deg) × 3.14159265359 / 180)
  • Cos 2 Theta calculates its result from Theta (deg). It uses the formula Calculated with the verified ST Calculator runtime.. Change any input to recalculate the result instantly.
  • The main inputs are Theta. Enter them in the units and format shown in the calculator.
  • Keep comparable quantities in compatible units whenever the formula combines or compares them.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Cos 2 Theta

Inputs
  • Theta: 30 deg

Using Theta (deg) = 30, the calculated result is cos(2θ): 0.5.

Sample result: Calculating…

Frequently asked questions

What does the Cos 2 Theta calculate?

Cos 2 Theta — free online calculator.

Which values should I enter?

Enter Theta using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: cos(2θ) = cos(2 × Theta (deg) × 3.14159265359 / 180).

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026