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求cos5π/12sinπ/12
人气:264 ℃ 时间:2020-06-08 02:30:13
解答
∵Cos5π/12=Sin(π/2-5π/12 )
=Sinπ/12
∴cos5π/12sinπ/12 =S²inπ/12
=(1—Cosπ/6)/2=(2-√3)/4
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