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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