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Q.

If f(x)=log1x1+x, then f(x1+x21+x1x2)=

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a

f(x1)+f(x2)

b

f(x1).f(x2)

c

f(x1)f(x2)

d

f(x1)f(x2)

answer is A.

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Detailed Solution

f(x1+x21+x1x2)=log(1x1+x21+x1x21+x1+x21+x1x2)

=log(1+x1x2x1x21+x1x2+x1+x2)

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

=log(1x11+x1)+log(1x21+x2)

=f(x1)+f(x2)

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If f(x)=log1−x1+x, then f(x1+x21+x1x2)=