y=ln(tanx)/ln(sinx),求dy/dx,

y=ln(tanx)/ln(sinx)dy/dx = [lnsinx 。d/dx(lntanx) - lntanx d/dx(lnsinx) ] /[ln(sinx)]^2= [lnsinx 。(1/tanx) (secx)^2 -lntanx 。(1/sinx) cosx ] /[ln(sinx)]^2