已知csc(x)=-13/12,求tan(x/2)=?

求sin^2(x)+tan^2(x)+csc^2(x)+sec^2(x)+cos^2(x)+cot^2(x)=31里,x 已知α角的终边上一点p（x,-2）,且丨op丨=4,求tanα,cscα的值 sinx=根号3/2 90〈X〈180度 求 cos x ,tan x ,cot x,sec x,csc x 等于多少 f(x)=|sin x+cos x+tan x+cot x+sec x+csc x|最小值 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 csc(-x)= 设y=(tan^2 x-csc^2 x )/(tan^2 x+cot^2 x -1) (a)证明y=1- 2/(tan^ tan x /(1-cot x) + cot x /(1-tanx) = 1+ sec x csc x 谁能帮我解一下“tan x + cot x = sec x csc x” 已知函数f(x)=sin^2x+csc^2x+cos^2x+sec^2x+tan^2x+7cot^2x,x∈(0,π/4 f(x)=|sin x+cos x+tan x+cot x+sec x+csc x|最小值答对马上采纳,