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10 cards from this deck
sin 2θ = 2 sin θ cos θ
cos 2θ = cos²θ - sin²θ
tan 2θ = 2tan θ / (1 - tan²θ)
sin(θ + θ) = 2 sin θ cos θ
cos(θ + θ) = cos²θ - sin²θ
Set 2x = cos⁻¹(0.5) + 2nπ or 2x = -cos⁻¹(0.5) + 2nπ
x = 15° + n90° or x = 75° + n90°, n ∈ Z
tan(2x) = 2tan x / (1 - tan²x)
They simplify calculations and prove identities.
For simplification, solving equations, and proving identities.
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