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Double Angle Formula

How to use formula to express exact values

The double angle identities take two different formulas

sin2θ = 2sinθcosθ
cos2θ = cos²θ − sin²θ

angle sum formulas

Here's a reminder of the angle sum formulas:
sin(A+B) = sinAcosB + cosAsinB

cos(A+B) = cosAcosB − sinAsinB

A + B = 2θ
sin(2θ) = sinθcosθ + cosθsinθ

sin(2θ) = 2sinθcosθ

cos(2θ) = cosθcosθ − sinθsinθ
- cos(2θ) = cos²θ − sin²θ

double angle formula | angle sum formula | pythagorean identities

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