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求和sina+sin2a +sin3a+...+sin(na) n为正整数.
2个回答
相关问题
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sin a+sin 2a +sin 3a +...+sin na怎么求和?
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sin a+sin 2a +sin 3a +...+sin na怎么求和?
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正项级数证明级数sinA/1^2+sin2A/2^2+sin3A/3^2+……+sin(nA)/n^2+……对任何A都收
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sinA+2sin3A+sin5A/sin3A+2sin5A+sin7A
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化简：SinA+2Sin3A+Sin5A/Sin3A+2Sin5A+Sin7A
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(sin2A-2sinA)/(sin2A+2sinA)=
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sina+sin2a+sin3a最大值
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求证:sin5a+sina=2sin3a*cos2a
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证明sin^2a+sin^2β+1>sina*cosa+sina+sinβ
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懂得进.证明,sina+sin(a+b)+sin(a+2b)+...sin(a+nb)=sin(a+ab/2)sin[(