cos(α-38°)cos(22°+α)+sin(α-38°)sin(22°+α)的值为多少?
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/11 10:27:28
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cos²α+cos²(120°-α)+cosαcos(120°-α)化简cos²α+cos²(120°-α)+cosαcos(120°-α)
cos²α+cos²(120°-α)+cosαcos(120°-α) cos²α+cos²(120°-α)+cosαcos(120°-α)
怎样化简cosαcos(60°-α)+1
证明cos(360°-α)=cosα OK?
求cosα+cos(120°-α)的最大值
化简cosα+cos(120°-α)+cos(120+α)
cos(α-38°)cos(22°+α)+sin(α-38°)sin(22°+α)的值为多少?
cosα
化简:cos^21°+cos^22°+cos^23°.+cos^289°要详细过程
求证:|cosα+cosβ|
cos²(40°+α)+cos²(30°-α)+cos²(50°+α)×tan(60°-α)急急帮帮忙cos²(40°+α)+cos²(30°-α)+cos²(50°+α)×tan(60°-α)
化简cos(60°+α)=
Cos(180°-α)=( )
求证cos(720°+α)(2/cosα+tanα)(1/cosα-2tanα)=2cosα-3tanα
化简:(1)(cos²10°-cos²80°)²+cos²70°=? (2)(sinα-cosα)²+sin4α/2cos2α=
sinα+cosβ=sin225° sinα-cosβ=cos225°求cos(α-β)及cos(α+β)
求和:cos(0)+cos(α)+cos(2α)+cos(3α)+……cos(nα)
Cos(180°+α)*sin(α+360°)/sin(-α-180°)*cos(-180°-α)