(cos15°-cos75°)(sin75°+sin15°)
=(sin75-cos75)(sin75+cos75)
=sin²75-cos²75
=-(cos²75-sin²75)
=-cos(2×75)
=-cos150
=√3/2
(cos15°-cos75°)(sin75°+sin15°)怎么化简?
(cos15°-cos75°)(sin75°+sin15°)怎么化简?
数学人气:810 ℃时间:2020-04-02 17:58:54
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