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数学
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( sina*sina-cosa*cosa)/cos2a*sina+cos2a*cosa)=
0≤a≤π
人气:216 ℃ 时间:2020-01-31 23:30:09
解答
原式=-(cos2a-sin2a)/[cos2a(sina+cosa)]
=-cos2a/[cos2a(sina+cosa)]
=-1/(sina+cosa)
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