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a
0
b
-1
c
1
d
2
answer is C.
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Detailed Solution
log42fx1-fx=x⇒2fx1-fx=4x 1Replacing x by 1-x, we get 2f1-x1-f1-x=41-x 2Multiplying (1) and (2), we get2fx1-fx2f1-x1-f1-x=41-x⇒fxf1-x=1-fx-f1-x+fxf1-x⇒fx+f1-x=1Putting x=2010, we getf2010+f-2009=1