nynw.net
当前位置:首页 >> 求不定积分∫E^xsin2xDx >>

求不定积分∫E^xsin2xDx

请采纳

∫ (e^x)sin²x dx = (1/2)∫ (e^x)(1 - cos2x) dx = (1/2)∫ e^x dx - (1/2)∫ (e^x)cos2x dx = (1/2)e^x - (1/2) • I I = ∫ (e^x)cos2x = (1/2)∫ e^x d(sin2x) = (1/2)(e^x)sin2x - (1/2)∫ (e^x)sin2x dx = (1/2)(e^x)sin2x - (1/2)(-1/...

∫ 1/(4+9x²) dx = (1/4) ∫ dx/[1+(3x/2)²] = (1/4)(2/3) ∫ d(3x/2)/[1+(3x/2)²] = (1/6)arctan(3x/2) + C

An ounce of prevention

∫sinxsin2xdx =-1/2∫(cos3x-cosx)dx =-1/2[1/3sin3x-sinx]+C =-1/6sin3x+1/2sinx+C

∫sin3xe^(-2x)dx=-1/3∫e^(-2x)dcos3x =-1/3cos3xe^(-2x)+1/3∫cos3xde^(-2x) =-1/3cos3xe^(-2x)-2/3∫cos3xe^(-2x)dx =-1/3cos3xe^(-2x)-2/9∫e^(-2x)dsin3x =-1/3cos3xe^(-2x)-2/9sin3xe^(-2x)+2/9∫sin3xde^(-2x) =-1/3cos3xe^(-2x)-2/9sin3xe^(-2...

1、先求∫e^x*cos2x dx ∫e^x*cos2x dx = (1/2)∫e^x d(sin2x) = (1/2)(e^x)(sin2x) - (1/2)∫e^x*sin2x dx = (1/2)(e^x)(sin2x) - (1/2)(-1/2)∫e^x d(cos2x) = (1/2)(e^x)(sin2x) + (1/4)(e^x)(cos2x) - (1/4)∫e^x*cos2x dx,将最后那个积分移到左...

1、先求∫e^x*cos2x dx ∫e^x*cos2x dx = (1/2)∫e^x d(sin2x) = (1/2)(e^x)(sin2x) - (1/2)∫e^x*sin2x dx = (1/2)(e^x)(sin2x) - (1/2)(-1/2)∫e^x d(cos2x) = (1/2)(e^x)(sin2x) + (1/4)(e^x)(cos2x) - (1/4)∫e^x*cos2x dx,将最后那个积分移到左...

1、先求∫e^x*cos2x dx ∫e^x*cos2x dx = (1/2)∫e^x d(sin2x) = (1/2)(e^x)(sin2x) - (1/2)∫e^x*sin2x dx = (1/2)(e^x)(sin2x) - (1/2)(-1/2)∫e^x d(cos2x) = (1/2)(e^x)(sin2x) + (1/4)(e^x)(cos2x) - (1/4)∫e^x*cos2x dx,将最后那个积分移到左...

∫e^xsinxcosxdx =1/2∫e^xsin2xdx =1/2∫sin2xde^x =1/2(e^xsin2x-∫e^xdsin2x) =1/2(e^xsin2x-2∫e^xcos2xdx) =1/2(e^xsin2x-2∫cos2xde^x) =1/2(e^xsin2x-2e^xcos2x+2∫e^xdcos2x) =1/2(e^xsin2x-2e^xcos2x-4∫e^xsin2xdx) 于是: 5/2∫e^xsin2xdx = 1...

网站首页 | 网站地图
All rights reserved Powered by www.nynw.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com