cosX √3sinX如何化?
f(x)=1-cosX √3sinX如何化简
(1-cosx)/sinx =sinx(1-cosx)/sin²x =sinx(1-cosx)/(1-cos²x) =sinx(1-cosx)/(1+cosx)(1-cosx) =sinx/(1+cosx) =2sin(x/2)cos(x/2)/2cos²(x/2) =sin(x/2)/cos(x/2) =tan(x/2)
答:1.F(x)=sinx+cosx+2asinxcosx,设t=sinx+cosx=√2sin(x+π/4),则2asinxcosx=a(t²-1),∵...详情>>
答:详情>>