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Q.

If 3f(x)+2f(1x)=1x−5∀x≠0 , then ∫12f(x)dx=

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a

3ln2+45

b

3ln2−45

c

3ln2−85

d

3ln2+85

answer is C.

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Detailed Solution

3f(x)+2f(1x)=1x−5,x→1x 3f(1x)+2f(x)=x−5 Eliminating of f(1x)→5f(x)=3x−15−2x+10=3x−2x−5 ∫12f(x)dx=15∫12(3x−2x−5)dx                     =15(3ln2−8)
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If 3f(x)+2f(1x)=1x−5∀x≠0 , then ∫12f(x)dx=