simplify (1+tan²Ф)(1-sinФ)(1+sinФ)
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(1+tan²Ф)(1-sinФ)(1+sinФ)
= sec²Ф(1-sin²Ф)
= sec²Фcos²Ф
= 1
= sec²Ф(1-sin²Ф)
= sec²Фcos²Ф
= 1
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