Easily calculate Cos 2 Theta for any angle in degrees or radians. This tool helps you understand and apply the cosine double angle identity quickly for various mathematical and engineering problems. Simplify complex trigonometric calculations with precision.
Formula:
The Cos 2 Theta (Cos(2θ)) identity is a fundamental concept in trigonometry, often expressed in several forms:
- In terms of Cosine and Sine: cos(2θ) = cos2θ - sin2θ
- In terms of Cosine only: cos(2θ) = 2cos2θ - 1
- In terms of Sine only: cos(2θ) = 1 - 2sin2θ
- In terms of Tangent only: cos(2θ) = (1 - tan2θ) / (1 + tan2θ)
Our calculator uses the direct angle calculation: cos(2θ) = cos(2 × θ), where θ is the input angle.