lượng giác 11

K

kenny_111

1)tanx=tan(-pi/5)
=>>x=-pi/5+kpi
pi/2<-pi/5+kpi<pi
tim k =>> cac nghiem cua pt
2)cos(8sinx)=1
sinx= kpi/4
ma -1=<sinx=<1
=>> -1=<kpi/4=<
=>> p/s k thuoc Z
sr ban minh hok bik cong thuc toan nen hoi kho doc :(
 
Last edited by a moderator:
You must log in or register to reply here.
Top Bottom