SIN2X=兀/6 0

sin2x-cos2x=0 limx→0 (x+sin2x)/(x-sin2x)=几? sin3x-sin2x+sinx=0 cos2x+cosx=0,则sin2x+sinx limx→0(x/sin2x)= 若4sin2x-6sinx-cos2x+3cosx=0．求：cos2x−sin2x(1−cos2x)(1−tan2x) lim(X->0)sin2x/x =lim(X->0)2(sin2x/2x)=2 函数y=(cos2x+sin2x)/(cos2x-sin2x 向量a=(sin2x,厂3),向量b=(-1,sin(2x-兀/6) sinx*sin2x*sin3x=? y=sin2x求导 sinx+2cosx=0,则sin2x+cos2x=