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45gaody mobi(epub转换mobi软件)
时间:2010-12-5 17:23:32 作者:国际新闻 来源:国际新闻 查看: 评论:0
内容摘要:y=Θ*sinΘ+½cosΘ,求dy/dΘ,Θ=45°y= θsinθ +(1/2)cosθ dy/dθ =θcosθ+sinθ -(1/2)sinθ dy/dθ|θ=π/4 =(π/4)(√
y=Θ*sinΘ+½cosΘ,求dy/dΘ,Θ=45°y= θsinθ +(1/2)cosθ dy/dθ =θcosθ+sinθ -(1/2)sinθ dy/dθ|θ=π/4 =(π/4)(√2/2) + (1/2)(√2/2) =(√2/2) ( π/4 + 1/2)