A=tan1100.tan3400+sin1600.cos1100+sin2500.cos3400=tan(900+200).tan(3600−200)+sin(1800−200).cos(900+200)+sin[3600−(900+200)].cos(3600−200)
=cos200.tan200−sin2200−cos2200=cos2200−cos2200=0
B=tan2250−cot810.cot690cot2610+tan2010
=tan(1800+450)−cot(900−90).cot(900−210)cot(1800+900−90)+tan(1800+210)
=1−tan90.tan210tan90+tan210=1tan(90+210)=√3