sinθ/2=√(x-1/2x) ,tanθ=?
sinθ/2=√(x-1/2x) ,tanθ=?
证明(1-2sin x cos x )/(cos^2x-sin^2x)=(1-tan x)/(1+tan x)
证明1-tan^2x/1+tan^2x=cos^2x-sin^2x
已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x
证明tan^2x-sin^2x=tan^2 sin^2x
求证 1+2sinxcox/cos∧2x-sin∧2x=1+tanx/1-tanx tan∧2θ-sin∧2θ=tan∧
tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 顺便问一下. tan,sin,
证(1/sin^2x)+(1/cos^2x)-(1/tan^2x)=2+tan^2x
求证 (1—tan^2X)/(1+tan^2X)=cos^2X—sin^2X
sin(2x) = (2*tan(x))/(1+tan(x)^2)有这个公式吗?求证明
证明1/sin^x+1/cos^2x-1/tanx^2x=2+tan^2
函数f(x)=sin(2x+φ)+根号三cos(2x+θ)是奇函数,则tanθ等于