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Questions  

 If y2+logecos2x=y,x-π2,π2 then: 

a
y'0+y''0=1
b
y''0=2
c
y'0+y''0=3
d
y''0=0

detailed solution

Correct option is B

The given equation is y2+logecos2x=y,x∈-π2,π2Differentiate both sides with respect tox2yy'-2tanx=y'...............(1)2yy''+2y'2-2sec2x=y''................(2) when x=0 y2+loge 1=yy2-y=0, ⇒y=0,1 if x=0 and y=0⇒y'(0)=0∣ if x=0 and y=1⇒y'(0)=0 equation (2)2yy''+2y'2-2sec2x=y'' at x=0⇒2yy''-2=y''⇒y''(2y-1)=2⇒y''(0)=22y-1=-2;y=02y=1 ⇒y''(0)=2

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