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secΘ = 1/cosΘ
secΘ/cosΘ - 1 = 1/cos²Θ - 1 = (1-cos²Θ)/cos²Θ = sin²Θ/cos²Θ = tan²Θ
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secΘ = 1/cosΘ
secΘ/cosΘ - 1 = 1/cos²Θ - 1 = (1-cos²Θ)/cos²Θ = sin²Θ/cos²Θ = tan²Θ