已知sin(x+30°)=2sin(x-30°),则tanx=( ) 请求详解
已知sin(x-45°)=四分之根号2,求sinxcosx,tanx+1/tanx
已知函数fx=(1+1/tanx)sin^x-2sin(x+π/4)sin(x-π/4)
已知tanx=- (2分之1),则sin^2x+3sin^2xcosx-1=
已知(1+tanx)/(1-tanx)=3 求(sin^2x+2sinx·cosx-cos^2x)/(sin^2x+2c
已知sin(x/2)-cos(x/2)=0求tanx
若f(x)=2tanx-2sin
求证(tanxtan2x/tan2x-tanx)/(tan2x-tanx)+√3(sin^2x-cos^2x)=2sin
已知sin(x-45°)=√2/4.求(1)sinxcosx值,(2)求tanx+(1/tanx)值
若sin(x+y)=1/2,sin(x-y)=1/3,则tanx/tany等于?
已知2tanx/1+tanx=3/5,求sin(π/4+x)的值 过程
已知(2sin^2x+sin2x)/(1+tanx)=1/2(π/4
求证(1-2sinXcosX)/(cosX^2-sin^2X)=(1-tanX)/(1+tanX)