化简:cos^2x / ( cot(x/2)-tan(x/2) )
化简sin(派-x)+sin(派+x)-cos(-x)+cos(2派-x)-tan(派+x)cot(派-x)
化简:sin(2派-x)tan(派+x)cot(-x-派)/tan(3派-x)cos(派-x)
化简cos(π/2-x)cos(π/2+x)cot(π-x)/sin(3π/2+x)cos(3π+x)tan(π+x)
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
谁能帮忙整理下sin x、cos x、tanx、cot x、tan x/2、sin 2x、cos 2x、sec x、cs
f(a)=[sin(π-x)cos(2π-x)tan(-x+3π/2)]/cot(-x -π)sin(-π--x) 化简
化简tan(3x/2)-tan(x/2)-sinx/(cos(3x/2)*cos(x/2))
求sin^2(x)+tan^2(x)+csc^2(x)+sec^2(x)+cos^2(x)+cot^2(x)=31里,x
.若f(x)={sin(n派-x)cos(n派+x)/cos[(n+1)派-x]}*tan(x-n派)cot[(n派/2
化简:sin(3丌-a)/tan(a-5丌)x tan(-a+2丌)/cot(丌-a)x cos(4丌-a)/sin(-
sinx=根号3/2 90〈X〈180度 求 cos x ,tan x ,cot x,sec x,csc x 等于多少