sin,cos,tg,ctg,sec,csc30'60'90'180'的值是多少?

问题描述:

sin,cos,tg,ctg,sec,csc30'60'90'180'的值是多少?

sin30'=1/2sin60'=(根号3)/2sin90'=1sin180'=0cos30'=sin60'cos60'=sin30'cos90'=0cos180'=-1tg30'=(根号3)/3tg60'=3tg90'无意义tg180'=0ctg30'=根号3ctg60'=1/3ctg90'=0ctg180'无意义secsecseccsccsccsc...