谁能帮我解一下这道题(sin(x+y))/(sin x sin y) = cot y + cot x
谁能帮我解一下这道题(sin(x+y))/(sin x sin y) = cot y + cot x
求证:sin(x-y)sin(x+y)/sin²xcos²y=1-cot²xtan
如果y=|sin x+cos x+tan x+cot x+sec x+cscx| 那么y的最小值是多少?
z=ln sin(xy) 则 z'y=x cot(xy).判断这题对错.
x=2(cot t),y=2(sin²t),用t表示dy/dx
sinθ=y/r,cosθ=x/r,tanθ=y/x,cotθ=x/y怎么证明?
x*y'*sin(y/x)-y*sin(y/x)+x=0 求微分方程的解
sin(x)^y求导
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证明sin(x+y)sin(x-y)=sinx-siny
tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 顺便问一下. tan,sin,
证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+