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Let the function f : R → R be defined by f(x) = x3 – x2 + (x – 1) sin x and let g : R → R be an arbitrary function. Let fg : R → R be the product function defined by (f g) (x) = f(x) g(x). Then which of the following statements is/are TRUE ?   
  • a)
    If g is continuous at x = 1, then fg is differentiable at x = 1  
  • b)
    If fg is differentiable at x = 1, then g is continuous at x = 1  
  • c)
    If g is differentiable at x = 1, then fg is differentiable at x = 1
  • d)
    If fg is differentiable at x = 1, then g is differentiable at x = 1
Correct answer is option 'A,C'. Can you explain this answer?
Verified Answer
Let the function f : R → R be defined by f(x) = x3 – x2 + (...
f : R → R f(x) = (x2 + sinx) (x–1)    f (1+) = f (1-) = f (1) = 0
fg(x) : f(x).g(x) fg : R→R
let fg(x) = h(x) = f(x).g(x)  h:R→R  
option (c) h'(x) = f'(x)g(x) + f(x) g'(x)    
h'(1) = f'(1) g(1) + 0,    
(as f(1) = 0, g'(x) exists}
⇒ if g(x) is differentiable then h(x) is also differentiable (true)  
option (A) If g(x) is continuous at x = 1 then g(1+) = g(1-) = g(1)  


So h(x) = f(x).g(x) is differentiable    
at x = 1  (True) 
option (B) (D) 

⇒ g(1+) = g(1-
So we cannot comment on the continuity and differentiability of the function. 
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Most Upvoted Answer
Let the function f : R → R be defined by f(x) = x3 – x2 + (...
The function f : R refers to a function that maps the real numbers to some other set or space. In other words, f is a function that takes a real number as input and produces an output in a different set or space. The precise definition of the function f would depend on the specific context or problem at hand.
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Let the function f : R → R be defined by f(x) = x3 – x2 + (x – 1) sin x and let g : R → R be an arbitrary function. Let fg : R → R be the product function defined by (f g) (x) = f(x) g(x). Then which of the following statements is/are TRUE ? a)If g is continuous at x = 1, then fg is differentiable at x = 1 b)If fg is differentiable at x = 1, then g is continuous at x = 1 c)If g is differentiable at x = 1, then fg is differentiable at x = 1d)If fg is differentiable at x = 1, then g is differentiable at x = 1Correct answer is option 'A,C'. Can you explain this answer?
Question Description
Let the function f : R → R be defined by f(x) = x3 – x2 + (x – 1) sin x and let g : R → R be an arbitrary function. Let fg : R → R be the product function defined by (f g) (x) = f(x) g(x). Then which of the following statements is/are TRUE ? a)If g is continuous at x = 1, then fg is differentiable at x = 1 b)If fg is differentiable at x = 1, then g is continuous at x = 1 c)If g is differentiable at x = 1, then fg is differentiable at x = 1d)If fg is differentiable at x = 1, then g is differentiable at x = 1Correct answer is option 'A,C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Let the function f : R → R be defined by f(x) = x3 – x2 + (x – 1) sin x and let g : R → R be an arbitrary function. Let fg : R → R be the product function defined by (f g) (x) = f(x) g(x). Then which of the following statements is/are TRUE ? a)If g is continuous at x = 1, then fg is differentiable at x = 1 b)If fg is differentiable at x = 1, then g is continuous at x = 1 c)If g is differentiable at x = 1, then fg is differentiable at x = 1d)If fg is differentiable at x = 1, then g is differentiable at x = 1Correct answer is option 'A,C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Let the function f : R → R be defined by f(x) = x3 – x2 + (x – 1) sin x and let g : R → R be an arbitrary function. Let fg : R → R be the product function defined by (f g) (x) = f(x) g(x). Then which of the following statements is/are TRUE ? a)If g is continuous at x = 1, then fg is differentiable at x = 1 b)If fg is differentiable at x = 1, then g is continuous at x = 1 c)If g is differentiable at x = 1, then fg is differentiable at x = 1d)If fg is differentiable at x = 1, then g is differentiable at x = 1Correct answer is option 'A,C'. Can you explain this answer?.
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