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已知sin@=5cos@,则sin@*cos@=?
人气:159 ℃ 时间:2020-05-13 19:41:40
解答
tan@=5
sin@*cos@=(sin@*cos@)/[(sin@)^2+(cos@)^2]
=tan@/[(tan@)^2+1]
=5/(25+1)
=5/26
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