tan-1x和cotxtan-1x(-1在右上角)和cotx不一样啊?cos-1x(-1在右上角)和secx也不一样?

tan-1x和cotxtan-1x(-1在右上角)和cotx不一样啊?cos-1x(-1在右上角)和secx也不一样? ￡tan x(tan x+1)dx 1+(tan x)=? 求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y tan（ x/2+π/4）+tan（x/2-π/4 ）=2tanxtan(x/2+π/4)+tan(x/2-π/4)=[tan(x/2)+tan(π/4)]/[1-tan(x/2)tan(π/4)]+[tan(x/2)-tan(π/4)]/[1+tan(x/2)tan(π/4)]=[tan(x/2)+1]/[1-tan(x/2)]+[tan(x/2)-1]/[1+tan(x/2)]=[(tan(x/2)+1)^2-(tan(x/2)-1)^2]/[1-(tan(x 求(tan^2x-tanx+1)/(tan^2x+tanx+1)的最大值和最小值 -0.5 * tan(e^x)和0.5 * tan(1/(e^x))相等吗?如题,为什么 (tan x+1/tan)cos^2 x等于? 数学 [tan(x/2) +1 ]/[1 - tan(x/2)] + [tan(x/2) - 1]/[1 + tan(x/2)] 怎麼化简? tan^2x+1等于? tan^-1(x^2) .求导! (tan x)-1=什么? 判断函数y=(tan(x)*tan(x)-tan(x))/(1-tan(x))的奇偶性请写出过程,谢谢! [sin(540-x)/tan(900-x)]*[1/tan(450-x)*tan(810-x)]*[cos(360-x)/sin(-x)] 极限(1-x)tanπx/2 (1+tan(x))/sin(2x)不定积分 x(tan^-1 x)^2积分 tan(x+20)=1,x=?