已知y=(x^2)*sin(2x),求：对y求50次导

已知(sinx)2-(siny)2=m求sin(x y)sin(x-y)求sin(x+y)sin(x-y) 已知y=sin(2x+π/6) 求值域 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 已知y=(x^2)*sin(2x),求：对y求50次导 已知sinx=3/5,x∈(π/2,π),求【sin(x+y)+sin(x-y)】/【cos（x+y）+cos（x-y）】的值 已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2 已知sin(x+2y)=3sinx,求tan(x+y)*coty 已知sin(x+y)=1/2,sin(x-y)=1/3,求tanx,tany要不然我是看不懂的 已知sin(X+Y)=2/3,sin(X-Y)=1/5,求(tanX)/(tanY)的值 sin(x+y)sin(x-y)=k,求cos^2x-cos^2y y =(cos^2) x - sin (3^x),求y' y=sin平方x+2x求y' 已知:tan x=2 求:sin x+cos x/sin x-cos x=? 已知函数y=(sin x+ cos x)(sin x+cos x)+2cos x*cos x ,求它的递减区间语气亲和、态度友好 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=? 求y=sin[sin(x^2)]的导数 已知函数y=sin^2x+sinxcosx+2,(x属于R),求值域 已知函数y=cos²x-sin²x+2sinxcosx,求函数值域