sin(180+x)+cos(-x)/sin(180-x)+cos(360+x)=2 求tan(x+45）

sin(360--x)cos(180+x)cos(90+x) [Sin(1440+x)*cos(x-1080)]/[Cos(-108-x)*sin(-x-180)] cos x/sin x+sin x/(1+cos x) 化简. sin（sin（sin（sin（x）=cos（cos（cos（cos（x）,X等于多少? cos x /sin x= S=(cos^2 x+cos^4 x+.+cos^2n x)+(sin^2x+sin^4 x+.+sin^2n x)数列求和题!答案是(cos^4 x+sin^4 x-cos^2n+4 x-sin^2n+4 x)/sin^2 x.cos^2 x sin(180+x)+cos(-x)/sin(180-x)+cos(360+x)=2 求tan(x+45） (x*sin x*cos x)的导数 cos(sin x)怎么解 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 化简(sin x+cos x-1)(sin x-cos x+1)/sin 2x 化简cos(180°+x)*sin(x+360°)/[sin(-x-180°)*cos(-180°-x)] 化简：{cos(180*0+x)sin(x+360*0)}/sin(-x-180*0)cos(-180*0-x) 求化简:[Sin(1440+x)*cos(x-1080)]/[Cos(-108-x)*sin(-x-180)]谢谢各位大侠了啊 已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2 化简sin(x)(cos(x)+cos(3x)+cos(5x)+cos(7x)) matlab如何绘制参数函数的图像?x=cos(s)*cos(t);y=cos(s)*sin(t);z=sin(s);其中0 2cos x (sin x -cos x)+1