求sinα^4(sinα+cosα)^2的不定积分

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 03:48:00
求sinα^4(sinα+cosα)^2的不定积分
xKj0R(BNRǛ07٤&A)!\ Ȣ]NC<!M +I7#yr,?tW!ؕoi9,L,$!(AӣD/ k"6 # u[J;!BsMi<) Y#WL Y6w1.=d%5#k䢙 D}` 4h=_7xU!)v6fCLl! GGW@Jz]eWOMF,r&95;

求sinα^4(sinα+cosα)^2的不定积分
求sinα^4(sinα+cosα)^2的不定积分

求sinα^4(sinα+cosα)^2的不定积分
sinα^4(sinα+cosα)^2
=(1-cos²a)²(1+2sinacosa)
=(1-2cos²a+cos^4a)(1+2sinacosa)
=1+2sinacosa-2cos²a-4sinacos³a+cos^4a+2sinacos^5a
=1+sin(2a)-(cos2a+1)-2sinacos³a+cos^4a+2sinacos^a
=sin(2a)-cos2a-2sinacos³a+cos^4a+2sinacos^5a
∫sin(2a)-cos2a-2sinacos³a+cos^4a+2sinacos^5a da
=-(1/2)cos(2a)-(1/2)sin2a+∫2cos³ad(cosa)+∫cos^4ada-∫2cos^5a d(cosa)
=-(1/2)cos(2a)-(1/2)sin(2a)+(1/2)cos^4a-(1/3)cos^6a+∫cos^4ada
=-(1/2)cos(2a)-(1/2)sin(2a)+(1/2)cos^4a-(1/3)cos^6a+(1/4)cos³asina+(3/4)∫cos²ada
=-(1/2)cos(2a)-(1/2)sin(2a)+(1/2)cos^4a-(1/3)cos^6a+(1/4)cos³asina+(3/4)[(a/2)+(1/4)sin(2a)+C]
=3a/8-(1/2)cos(2a)-(5/16)sin(2a)+(1/2)cos^4a-(1/3)cos^6a+(1/4)cos³asina+C