KVPY2014MathematicsDefinite Integration
A continuous function f: R R satisfies the equation f(x)=x+ ₀^ x f(t) d t . Which of the following options is true ?
Options
- Af(x+y)=f(x)+f(y)
- Bf(x+y)=f(x) f(y)
- Cf(x+y)=f(x)+f(y)+f(x) f(y)
- Df(x+y)=f(x y)
Correct answer
C. f(x+y)=f(x)+f(y)+f(x) f(y)
Step-by-step solution
f^ (x)=1+f(x) f(0)=0 f(x) 1+f(x) =1 (1+f(x))=x then f(x+y)=f(x)+f(y) f(x) f(y)