2 câu trả lời
DK: x≠π/2+kπ
Ptrinh tuong duong vs
tanx+sin(x+π/4)cos(x+π/4)+2=0
<->tanx+sinx+cosxcosx−sinx+2=0
<->tanx+tanx+11−tanx+2=0
DK: tanx≠1 hay x≠π/4+2kπ.
tanx(1−tanx)+tanx+1+2(1−tanx)=0
−tan2x+3=0
tanx=±√3
TH1: tanx=√3
Vay x=π/3+kπ.
TH2: tanx=−√3
Khi do x=−π/3+kπ.
