d22Ify = x + tan x,prove that cos-x-12-2y + 2x=0.de- – InterviewSolution

1.	d22Ify = x + tan x,prove that cos-x-12-2y + 2x=0.de-
Answer» Y= x+tanxdy/dx=1+ sec2xd2y/dx2 = 2secx. secxtanx. 2sec2xtanxd2y/dx2 =2tanx/ cos2xCos^2x. d^2y/dx^2- 2tanx=0Cos^2x.d^2y/dx^2 - 2x - 2tanx +2x=0Cos^2x.d^2y/dx^2 - 2y+2x=

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