Plz plz solve this problem
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(cosec@ - cot@)²,
(1/sin@ - cos@/sin@)²,
[(1-cos@)/sin@]²,
(1-cos@)²/sin²@,
(1-cos@)²/(1-cos²@),
[(1-cos@)(1-cos@)]/[(1-cos@)(1+cos@)],
then
(1-cos@)/(1+cos@)
(1/sin@ - cos@/sin@)²,
[(1-cos@)/sin@]²,
(1-cos@)²/sin²@,
(1-cos@)²/(1-cos²@),
[(1-cos@)(1-cos@)]/[(1-cos@)(1+cos@)],
then
(1-cos@)/(1+cos@)
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