3) (sin5ß-1)(sin5ß+1) = sin²5ß - 1 = cos²5ß
4) 3-3/cos²5a = 3(cos²5a-1)/cos²5a = 3tan²5a
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3) (sin5ß-1)(sin5ß+1) = sin²5ß - 1 = cos²5ß
4) 3-3/cos²5a = 3(cos²5a-1)/cos²5a = 3tan²5a