已知cos(x+π/4)=3/5求sin2x-2sin^2x
已知cos(x+π/4)=3/5求sin2x-2sin^2x
已知cos(π/4-x)=-3/5,求sin2x/sin(x+π/4)
已知COS(π/4-X)=-4/5,求(SIN2X-2SIN^X)/(1+TANX)
已知cos(π/4+x)=3\5,求(sin2x-2sin^x)/1-tanx的值
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)=3/5,17π/12<x<7π/4,求sin2x+2sin平方x/(1-tanx)的值
已知tan(π/4-x)=-1/3,求 sin^2(x+π/4)/2cos^2+sin2x
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x
求函数fx=(sin^4x+cos^4x+sin^2x*cos^2x)/(2-sin2x)
已知cos(π/4+x)=-3/5,3/4π<x<5π/4,求(sin2x+2sin²x)/(1-tanx)的
已知cos(π/4+x)=3/5,5/4π<x<7π/4,求(sin2x+2sin²x)/(1-tanx)
急. .已知cos(π/4+x)=3/5,5/4π<x<7π/4,求(sin2x+2sin²x)/(1-tan