sin(x+π/4)=-3/5 sin2x=?
已知cos(π/4-x)=-3/5,求sin2x/sin(x+π/4)
已知cos(x+π/4)=3/5求sin2x-2sin^2x
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sin( pi/4 - x )=3/5 则sin2x=?
tan(π/4-x)=-1/3,sin^2 (x+π/4) /(2cos^2 x+sin2x)=?
已知函数f(x)=cos2x\ sin(x+π\4) 若f(x)= 4\3 ,求sin2x的值
已知X是第3象限角,且SIN^4X+COS^4X=5/9则SIN2X等于
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x
y=sin^2X+sin2X+3怎么求最值?
已知函数f(x)=(1+1/tanx)sin2x-2sin(x+π/4)sin(x-π/4)
两个个数学证明题1.证明:cos2x+sin2x=√2sin(sin2x+π/4)2.证明:αsinαx+cosαx=√