Ответы на вопрос:
[sint/cost]/[sint/cost +cost/sint] = sin²t
[sint/cost]/[(sint*sint + cost*cost)/cost*sint] = sin²t
[sint/cost]/[(sin²t+cos²t)/sint*cost] = sin²t
[sint/cost]/[1/sint*cost] = sin²t
sint/cost * sont*cost = sin²t
sint * sint = sin²t
sin²t = sin²t
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