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Q.

If ⨍ x+y=⨍ (x)⨍ (y) and ⨍ (x)=1+tan2xg(x) where is gx is
continuous then ⨍ 'x=

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a

⨍ xg0

b

12⨍ xg0

c

2⨍ xg0

d

2⨍ xg'0

answer is C.

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Detailed Solution

fx+y=fx+fy fx=i+tan 2x gx f0=1

f1x=limh0fx+h-fxh =limh0fxfn-fxf0h =fx limh0fh-1h =fx limh01+tan 2h gh-1h =fx limh0tan 2hh.gh f1x=2fxg0

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