sec x=?csc x=?

sec x=?csc x=? 求证(csc x+cot x)/(sec x+tan x)=(sec x- tan x)/(csc x- cot x) 化简：csc（x）-sec（x）= y=sec^2x+csc^2x求导 f(x)=|sin x+cos x+tan x+cot x+sec x+csc x|最小值 tan x /(1-cot x) + cot x /(1-tanx) = 1+ sec x csc x求证! 谁能帮我解一下“tan x + cot x = sec x csc x” 证明sec^2 x + csc^2 x = sec^2 x × csc^2 x右边是相乘1 + 2 = 2 × 1 y=sec^2(x/a)+csc^2(x/a)的导数怎么求?RT f(x)=|sin x+cos x+tan x+cot x+sec x+csc x|最小值答对马上采纳, 证明(tan^2x-cot^2x)/(sin^2x+cos^2x)=sec^2x+csc^2x csc(-x)= 简化三角函数:csc(x)/sin(x)-(cot(x)csc(x))/sec(x) cos(x)=-(1/8),π< x < (3π)/2sin(x)=?tan(x)=?cot(x)= sec(x)= csc(x)= 求sin^2(x)+tan^2(x)+csc^2(x)+sec^2(x)+cos^2(x)+cot^2(x)=31里,x的解法 下面微分方程的通解是多少 sec^2X cotY dX - csc^2 Y tanX dY=0 证明(tan^2x-cot^2x)/(sin^2x-cos^2x)=sec^2x+csc^2x^2=平方 求sec X,和csc X相关的所有公式!