Question

设a=sin(sin2011°）,b=sin(cos2011°）,c=cos(sin2011°）,d=cos(sos20

Answer 1

2011=5*360+211---则0>sin(2011)>-sqrt(2)/2>cos(2011)>-1------在【-1,0】属于【-pi/2,0】范围中,sin单增,cos单增,且cos>0>sin,那么0>a>b,c>d>0,综上,c>d>a