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### 28 Cards in this Set

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 cscθ = 1/sinθ tanθ = sinθ/cosθ cotθ = 1/tanθ OR cosθ/sinθ secθ = 1/cosθ sin^2θ + cos^2θ = 1 1 + tan^2θ = sec^2θ 1 + cot^2θ = csc^2θ sin(-θ) = -sinθ cos(-θ) = cosθ tan(-θ) = -tanθ sin(π/2 - θ) cosθ cos(π/2 - θ) sinθ tan(π/2 - θ) cotθ sin A/a = sin B/b = sin C/c a^2 = b^2 + ... c^2 - 2bc cosA b^2 = a^2 + c^2 ... - 2ac cosB c^2 = a^2 + b^2 ... - 2ab cosC sin(x+y) = sinxcosy + cosxsiny sin(x-y) = sinxcosy - cosxsiny cos(x+y) = cosxcosy - sinxsiny cos(x-y) = cosxcosy + sinxsiny tan(x+y) = tanx + tany/1 - tanxtany tan(x-y) = tanx - tany/1 + tanxtany sin2x = (Double Angle Formula) 2sinxcosx (Double Angle Formula) cos2x = cos^2x - sin^2x OR 2cos^2x - 1 OR 1 - 2sin^2x tan2x = 2tanx/1 - tan^2x sin^2x = 1 - cos2x/2 cos^2x = 1 + cos2x/2