JEE Main 2019 — Math solution | Fundamenthol

JEE Main2019Math

Q.

Let $f (x) = \frac{x}{a ^{2} + x ^{2}} - \frac{( d - x )}{b ^{2} + ( d - x ) ^{2}}, x \in R$ where a, b and d are non-zero real constants. Then :

A
f is a decreasing function of x
B
f is neither increasing nor decreasing function of x
C
f' is not a continuous function of x
D
f is an increasing function of x

Solution

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