(1+x^2)*sin(2x)的不定积分

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/27 04:39:27
(1+x^2)*sin(2x)的不定积分
x)0Ԯ3*0|>Ɏާf=_iGMR>!%v6DcH&PQBJX$ QVq Qji&t$ )`)M !bP{ <6iB <탈A|~c g rFaBm `鎞gsf?_dҧ;=d`|>|^ċ{_N_tYӳys^,_m]m@fXy';_]L J/:lg-Og{vҳΗ$فR

(1+x^2)*sin(2x)的不定积分
(1+x^2)*sin(2x)的不定积分

(1+x^2)*sin(2x)的不定积分
∫ (1+x²)sin2x dx
=∫ sin2x dx + ∫ x²sin2x dx
=-(1/2)cos2x - (1/2)∫ x² d(cos2x)
=-(1/2)cos2x - (1/2)x²cos2x + ∫ xcos2x dx
=-(1/2)cos2x - (1/2)x²cos2x + (1/2)∫ x d(sin2x)
=-(1/2)cos2x - (1/2)x²cos2x + (1/2)xsin2x - (1/2)∫ sin2x dx
=-(1/2)cos2x - (1/2)x²cos2x + (1/2)xsin2x + (1/4)cos2x + C
=-(1/4)cos2x - (1/2)x²cos2x + (1/2)xsin2x + C

希望可以帮到你,不明白可以追问,如果解决了问题,请点下面的"选为满意回答"按钮.