Question

Question #71f53

Answer 1

Subst.ing, `tanx=sinx/cosx=(sinx)(1/cosx)=sinxsecx,`

`=(1+secx)/(sinx+tanx)=(1+secx)/(sinx+sinxsecx)`

`=(1+secx)/{sinx(1+secx)}=1/sinx=cscx, if, secx!=-1.`