已知cos(π/4+x)=4/5 x∈(-π/2,-π/4),求(sin2x-2sin方x)/(1+tanx)的值
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/09/23 22:42:29
已知cos(π/4+x)=4/5 x∈(-π/2,-π/4),求(sin2x-2sin方x)/(1+tanx)的值
cos(π/4+x)=4/5 x∈(-π/2,-π/4),
sin(π/4+x)=-3/5 x∈(-π/2,-π/4),
sinx=sin(π/4+x) cosπ/4- sin(π/4) cos(π/4+x)= (-7√2 )/10;
cosx=√2 /10;
(sin2x-2sin方x)/(1+tanx)
=(2sinxcosx-2sinxsinx)/((cosx+sinx)/cosx)
=2sinxcosx(cosx-sinx)/(cosx+sinx)
=28/75
sin(π/4+x)=-3/5 x∈(-π/2,-π/4),
sinx=sin(π/4+x) cosπ/4- sin(π/4) cos(π/4+x)= (-7√2 )/10;
cosx=√2 /10;
(sin2x-2sin方x)/(1+tanx)
=(2sinxcosx-2sinxsinx)/((cosx+sinx)/cosx)
=2sinxcosx(cosx-sinx)/(cosx+sinx)
=28/75
已知COS(π/4-X)=-4/5,求(SIN2X-2SIN^X)/(1+TANX)
已知cos(π/4+x)=3/5,x∈(3π/4,7π/4),求sin2x+2Sin^x /1-tanx的值
已知cos(π/4+x)=3\5,求(sin2x-2sin^x)/1-tanx的值
已知cos(π/4+x)=3/5,17π/12<x<7π/4,求sin2x+2sin平方x/(1-tanx)的值
已知cos(x+p/4)=4/5,求sin2x-2sin^2x/1-tanx的值
已知cos(π/4+x)=-3/5,3/4π<x<5π/4,求(sin2x+2sin²x)/(1-tanx)的
已知cos(4分之π+x)=5分之4,x属于(-2分之π,-4分之π),求(1+tanx)分之(sin2x-2*(sin
设cos(π/4+x)=3/5,x∈(3π/4,7π/4),求(sin2x+2sin²x)/(1-tanx)
已知cos(x+π/4)=3/5,5π/4<x<7π/4,求 sin2x+2sin²x ÷ 1-tanx 的值
已知cos(π/4+x)=3/5,5/4π<x<7π/4,求(sin2x+2sin²x)/(1-tanx)
已知cos(x+π/4)=3/5求sin2x-2sin^2x
已知cos(π/4+x)=3/5,求[sin2x-2(sinx)^2]/(1-tanx)