if y = log (1 + cos x ), prove that d3y/ dx3 + d2y / dx2 dy/dx - Maths - Continuity and Differentiability

Question

if y = log (1 + cos x ), prove that d3y/
dx3 + d2y / dx2 dy/dx =
0

Rayya Halim · Accepted Answer

<img alt="" width="325" height="484" src=
"https://s3mn%20mnimgs%20com/img/shared/discuss_editlive/4572370/2013_03_18_23_55_45/image6627079565069702371%20jpg">
Hence proved

if y = log (1 + cos x ), prove that d3y/ dx3 + d2y / dx2 . dy/dx = 0

if y = log (1 + cos x ), prove that d³y/ dx³ + d²y / dx² . dy/dx = 0