1 sinxcosx 积分
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/30 03:31:20
∫sinxcosx/(1+sin^4x)dx=∫sinx/(1+sin^4x)d(sinx)=∫1/(1+sin^4x)d(1/2*sin²x)=(1/2)∫d(sin²x)/[1
sin^2xtanx+cos^2x/tanx+2sinxcosx-(1+cosx/sinxcosx)=sin^3x/cosx+cos^3x/sinx+2sinxcosx-(1+cosx/sinxcos
方法一:设tanx/2=t(后面写起来方便)原式=[2t/(1+t^2)]*[(1-t^2)/(1+t^2)]/[1+2t/(1+t^2)+(1-t^2)/(1+t^2)/=2t(1-t^2)/(2t
f(x)=(√3)sinxcosx+cos2x+1f(x)=(√3)(2sinxcosx)/2+cos2x+1f(x)=(√3/2)sin2x+cos2x+1f(x)=(√7/2)[(√3/2)(2/
Letu=1+sin(x)cos(x)=1+(1/2)sin(2x)anddu=cos(2x)dx→dx=du/cos(2x)So∫cos(2x)/(1+sin(x)cos(x))dx=∫1/udu=
∫dx/(sinxcosx)=∫(1/cos²x)/(sinx/cosx)dx,上下除以cos²x=∫sec²x/tanxdx=∫d(tanx)/tanx,(tanx)'
∵sin2x+cos2x=1,∴cos2x=1-sin2x,∴cosx•cosx=(1+sinx)(1-sinx),即1+sinxcosx=cosx1−sinx=-cosxsinx−1,∵1+sinx
2*(sinxcosx-cos平方x)+1=2sinxcosx-2cos²x+1=2sinxcosx-cos2x=sin2x-cos2x=√2sin(2x-45°)
sinx+cosx=1两边平方(sinx+cosx)²=1sin²x+cos²x+2sinxcosx=12sinxcosx=0∴sinx=0,cosx=1或cosx=0,
sinx/cosx
sinxcosx/(1+cosx∧2)dx=cox/(1+cosx∧2)dx=负的0.5*【1/(1+cos∧2)d(1+cos∧2)】然后就用∫1/mdm=㏑m不过此时的积分上下线变成了2和1,最后
怎么感觉cosx应该是平方啊再问:嗯的,打错了再答:(cosx)^2=(1+cos2x)/2sinxcosx=1/2*sin2x所以原式=(1+cos2x)/2-根号3/2*sin2x+1=1/2*c
=(1/2)∫dx/sin2x=(1/4)ln|cot2x-cot2x|+C代入上下限即可再问:呃…第一步系数应该是2吧再答:哦。那就=(2)∫dx/sin2x=ln|cot2x-cot2x|+C
(1-2sinxcosx)(1+2sinxcosx)=(sin²x+cos²x-2sinxcosx)(sin²x+cos²x+2sinxcosx)=(sinx-
∫1/(sinxcosx)^3dx=8∫1/(sin2x)^3dx=-4∫1/(sin2x)^4dcos2x=-4∫1/[1-(cos2x)^2]^2dcos2x设cos2x=y上式=-4∫1/[1-
∫sinxcosx/(1+sin^4x)dx=∫sinx/(1+sin^4x)d(sinx)=1/2*∫1/(1+(sin^2x)^2)d(sin^2x)=1/2*arctan(sin^2x)+C