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π/2 π 3π/2 0 sin²θ + cos²θ = 1 θ = 60° + 360°n π/3 rad = 60° 2π rad = 360° 420° ≡ 60° (mod 360°) sin(π/6) = 1/2 cos(π/3) = 1/2 arc = rθ e^(iπ) + 1 = 0 tan(θ) = sin(θ)/cos(θ) sec²θ = 1 + tan²θ sin(2θ) = 2sinθcosθ cos(π - θ) = -cos(θ) csc(θ) = 1/sin(θ) cot²θ + 1 = csc²θ f(x) = A·sin(Bx + C) period = 2π/B sin(α+β) = sinαcosβ + cosαsinβ cos(α-β) = cosαcosβ + sinαsinβ amplitude = |A| x y
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