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�� #2

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�) (1-cos^2�)/(1-sin^2� )

�) ( sin^2?�-1)/(1-cos^2� )

�) (2 sin��cos�)/(1-sin^2�)

�) sin^2�+cos^2�+ctg^2�

�) 1/cos^2� -1

�) 1- 1/sin^2�

�) (sin��sinb)/(cos��cosb)

�) (cos��sinb)/(sin��cosb)

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