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Sine and cosine functions have periods of: 2π Tangent functions have periods of: π How do you convert radians to degrees? (Radians x 180) / π How do you convert degrees to radians? (Degrees x π) / 180 What do you do with the number before the x in a function to find the period? Put it under π or 2π, depending on the function. How do you find the tangent of an angle? Tanx = (sinx/cosx)