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Q.

f(x)=log(1+x1x) satisfies the equation f(x1)+f(x2)=

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a

f(x1+x21+x1x2)

b

f(x1+x21x1x2)

c

f(x1x21+x1x2)

d

f(x1x2)

answer is A.

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Detailed Solution

f(x)=log(1+x1x)

f(x1)+f(x2)=log(1+x11x1)+log(1+x21x2)

=log((1+x1)(1+x2)(1x1)(1x2))

=log(1+x1+x2+x1x21x1x2+x1x2)

=log(1+(x1+x21+x1x2)1(x1+x21+x1x2))

=f(x1+x21+x1x2)

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f(x)=log(1+x1−x) satisfies the equation f(x1)+f(x2)=