化简√1+sin x /1-sin x -√1-sin x /1+sin x ,其中x为第2象限角

cos x/sin x+sin x/(1+cos x) 化简. (sin 1/x) /x 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x 化简[1-(sin^4 x-sin^2 xcos^2 x+cos^4 x)]/(sin^2 x)+3sin^2 x 化简(sin^2 x/sin x-cosx)-(sin x+cosx/tan^2 x-1) 化简√1+sin x /1-sin x -√1-sin x /1+sin x ,其中x为第2象限角 化简sin x/(1－cos x)√[(tan x－sin x)（tan）]化简sin x/(1－cos x)√[(tan x－sin x)/（tan x＋sin x）] 化简[1-(sin^4x-sin^2cos^2x+cos^4x)/(sin^2)]+3sin^2x sin(sinx)/x,x 趋于0的极限sin(sin(x))/x=[sin(sin(x))/sin(x)]*sin(x)/x=1*1=1sin(sin(x))/sin(x)这一部我不明白阿 cos x/( 1-sin x)化简 化简（1)√3sin x+cos x (2）√2(sin x-cos x) （3）√2cos x-√6sin x x*（1+sin^2 x )/sin^2x 不定积分 傅里叶级数作图f（x）=2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x]我用mathematica输入程序Plot[{2sin[x],-2sin[x],2sin[x] - sin[2x],-2sin[x] + sin[2x],2sin[x] - sin[2x] + 2/3sin[3x],-2sin[x] + sin[2x] - 2/3sin[3x],2sin[x] - sin[2x] + 2/3si 化简sin(2x-pi)sin[x+(3/2)pi]/cos[x+(5/2)pi][1-sin(pi+x)] 化简 1-sin^4x-cos^4x/1-sin^6x-cos^6x 化简(1-cos^4x-sin^4x)/(1-cos^6x-sin^6x) 化简：(1+sin x-cos x)/(1+sin x+cos x) 谢 化简 1/2cos x-根号3/2sin x 根3sin x+cos x