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∫sin3xCos2xDx

∫sin3xcos2xdx=-1/10cos5x-1/2cosx+C。C为积分常数。 解答过程如下: ∫sin3xcos2xd(x) =1/2∫(sin5x+sinx)dx =1/2(∫sin5xdx+∫sinxdx) =1/2(∫1/5sin5xd5x+∫sinxdx) = -1/10cos5x-1/2cosx+C 扩展资料: 分部积分: (uv)'=u'v+uv' 得:u'v=(uv...

∫sin3xcos2x dx =(1/2) ∫[ sin(5x) - sinx] dx =(1/2) [ -(1/5)cos(5x) +cosx] +C

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积化和差公式: sinαcosβ=1/2[sin(α+β)+sin(α-β)] 本题中,将3x看做α,2x看做β: sin3xcos2x = 1/2[sin(3x+2x)+sin(3x-2x)] = 1/2(sin5x+sinx)

由cos5x=cos(3x+2x) =cos3xcos2x-sin3xsin2x ① cosx=cos(3x-2x) =cos3xcos2x+sin3xsin2x ② ②-①得 cosx-cos5x=2sin3xsin2x 即sin3xsin2x=1/2(cosx-cos5x) 则sin3xsin2xdx=[1/2(cosx-cos5x)]dx =1/2cosxdx-1/2cos5xdx =1/2sinx-1/2*1/5sin5x =...

∫ (sin^4x)*(cos^2x) dx=1/16*x-1/64*sin4x-1/48*(sin2x)^3+C 解:∫ (sin^4x)*(cos^2x) dx =∫ ((1-cos2x)/2)^2*((cos2x+1)/2) dx =1/8∫ (1-cos2x))^2*(1+cos2x) dx =1/8∫ (1-cos2x-(cos2x)^2+(cos2x)^3) dx =1/8∫ 1 dx-1/8∫ cos2x dx-1/8∫ (cos2...

定积分偶倍奇零 =2∫(0.π/2)sin²xcos²xdx =1/2∫sin²2xdx =1/4∫1-cos4xdx =x/4-sin4x/16 =π/8

dy=3cos3x dx -2sin2x dx=(3cos3x-2sin2x)dx

第一步,(1-cosxcos2xcos3x一直乘到cosnx)和二分之一倍的(1平方 加 2平方 加加加加到 n平方)倍的x平方 是等价无穷小,具体的证明你可以用 ln(1加x)和x 这对等价无穷小(PS:这么代换有很大的好处,大家去试一下就明白了) 去证,,,不明白的...

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