设y=(tan^2 x-csc^2 x )/(tan^2 x+cot^2 x -1) (a)证明y=1- 2/(tan^4 x-tan^2 x +1) (b)求y值的范围

设y=(tan^2 x-csc^2 x )/(tan^2 x+cot^2 x -1) (a)证明y=1- 2/(tan^4 x-tan^2 x +1) (b)求y值的范围 y=sec^2x+csc^2x求导 y=tan(x+y) 求y的导数?一道大数数学题.它的答案是-csc^2(x+y) 请问它是怎么来的? 已知csc(x)=-13/12,求tan(x/2)=? 证明(tan^2x-cot^2x)/(sin^2x+cos^2x)=sec^2x+csc^2x 函数的导数y=-csc^2x 求证(csc x+cot x)/(sec x+tan x)=(sec x- tan x)/(csc x- cot x) 微积分方程求解e^x + (e^x cot y + 2y csc y)y' = 0 不定积分 ∫csc 2x dx= 设y=In tan 2x 求微分dy 求由这个方程y=tan(x+y)所确定的隐函数的二阶导数d^2y/dx^2 答案是-2csc^2(x+y)*cot^3(x+y)麻烦要过程 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 cos(x)=-(1/8),π< x < (3π)/2sin(x)=?tan(x)=?cot(x)= sec(x)= csc(x)= 证明(tan^2x-cot^2x)/(sin^2x-cos^2x)=sec^2x+csc^2x^2=平方 求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y sinx=根号3/2 90〈X〈180度 求 cos x ,tan x ,cot x,sec x,csc x 等于多少 确定下列函数的连续范围y=tan(x)+csc(x)和y=sgn(sinx) y=sec^2(x/a)+csc^2(x/a)的导数怎么求?RT