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Cos 2 Theta Calculator
Evaluate cos(2 theta) using all three double angle identities.
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cos(2 theta)
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Evaluate cos(2 theta) using all three double angle identities.
Cos 2 Theta Estimator
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0
๐ก Tip: cos(2t) = cos2 t – sin2 t = 2cos2 t – 1 = 1 – 2sin2 t.
How It Works
Key concepts behind this calculator
1
Enter Values
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2
Calculate
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3
Review
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4
Adjust
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Quick Reference Guide
Cos Quick Guide
Typical values for reference.
| Theta | cos | sin | cos 2 theta |
|---|---|---|---|
| 0 deg | 1.0000 | 0.0000 | 1.0000 |
| 30 deg | 0.8660 | 0.5000 | 0.5000 |
| 45 deg | 0.7071 | 0.7071 | 0.0000 |
| 60 deg | 0.5000 | 0.8660 | -0.5000 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Cos 2 Theta Calculator FAQ
Answers to common questions about this calculator.
cos 2t = cos2 t – sin2 t.
2 cos2 t – 1 and 1 – 2 sin2 t.
0.5.
Integration and trig simplification.