Use this calculator to determine the double angle equivalent of a given angle theta, and the trigonometric function of your choice.
Double Angle Formula
The term double angle, refers to the expression of a trigonometric value of two times and angle θ. The follow formulas can be used to calculate the double angle.
sin(2θ)
cos(2θ)
tan(2θ)
Some additional equivalent formulas can be seen below. The reason that these formulas are special is because doubling the angle of a trigonometric function does not in fact yield double the result.
Using the calculator below, enter the angle theta ( θ ) and select the sine, cosine, or tangent depending on which trigonometric function you want to use.
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