证明tan^2x-sin^2x=tan^2 sin^2x
证明tan^2x-sin^2x=tan^2 sin^2x
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
tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 顺便问一下. tan,sin,
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
证明(tan^2x-cot^2x)/(sin^2x-cos^2x)=sec^2x+csc^2x
证明(tan^2x-cot^2x)/(sin^2x+cos^2x)=sec^2x+csc^2x
化简(sin^2 x/sin x-cosx)-(sin x+cosx/tan^2 x-1)
用matlab绘制y=tan(sin(x^2))
证明1/sin²x+1/cos²x-1/tan²x=2+tan²x限今天速度