JEE Main 2026 Mathematics question
Let f : ℝ→ℝ be such that f(xy)=f(x)f(y), for all x,y∈ℝ and f(0)≠0. Let g : [1,∞)→ℝ be a differentiable function such that . Then g(2) is equal to:
Answer: (C)
Solution
f(0)=f(0)f(y) with f(0)≠0 gives f≡1. Differentiating x²g(x)=∫₁ˣ(t²−tg)dt: x²g′+2xg=x²−xg, so
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