(1 - sin²(a))/cos²(a) - sin²(a) = cos²(a)/cos²(a) - sin²(a) = 1 - sin²(a) = cos²(a)
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(1 - sin²(a))/cos²(a) - sin²(a) = cos²(a)/cos²(a) - sin²(a) = 1 - sin²(a) = cos²(a)