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(1+y)tan^2x+tanx*dy/dx+y=0 .If lim(xrarr...

`(1+y)tan^2x+tanx*dy/dx+y=0` .If `lim_(xrarr0^+)x*y(x)=1 "then" y(pi/4)= ?`

A

`pi/4-1`

B

`pi/4`

C

`-pi/4`

D

None

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