因为sin55°、cos55°=sin35°所以cos55°而sin55°<1,、tan55°>1所以sin55°即、cos55°
sin55°>sin45º=√2/2cos55°∴sin55°>cos55°又知道任意角的正弦值都是小于等于1的话而tan55°>tan45º=1∴tan55°>sin55°>cos55°
