Cos 2A Identity
cos double angle
Definition
Double angle formula for cosine.
Related Formulas
Cos 3x
cos triple angle
Sin A + Sin B
sum to product sin
Cos A + Cos B
sum to product cos
Study Tools
Question
Cos 2A Identity
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Answer
cos double angle
Double angle formula for cosine.
Used In
- Trigonometry
Frequently Viewed Together
Area of Circle
A = pi*r*r
Quadratic Formula
quadratic formula roots
Pythagoras Theorem
c*c = a*a + b*b