Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Explain solution for RD Sharma Class 12 Chapter Function Exercise 2.3 Question 5 maths textbook solution.

Explain solution for RD Sharma Class 12 Chapter Function Exercise 2.3 Question 5 maths textbook solution.

Answers (1)

Answer : f \circ g(x)=\sin 2 x ; g \circ f(x)=2 \sin x and they are not equal functions.

Given : Here given that f(x)=\sin x \; \text {and} \; g(x)=2 x

             Here we have to compute g\; o\; f and f\; o\; g

Hint : First we will compute g\; o\; f

we know that f: R \rightarrow[-1,1] \text { and } g: R \rightarrow R

Clearly the range of f is a subset of the domain of g.

Second, we will compute f\; o\; g

Clearly the range of g is a subset of the domain of f.

Solution :

\begin{aligned} &g \circ f: R \rightarrow R \\ &(g \circ f)(x)=g(f(x)) \\ &\qquad \begin{aligned} &=g(\sin x) \\ &=2 \sin x \end{aligned} \end{aligned}                                                               ....(1)

\begin{aligned} &f \circ g: R \rightarrow R \\ &\text { So, } f \circ g(x)=f(g(x)) \\ &\qquad \begin{aligned} &=f(2 x) \\ &=\sin 2 x \end{aligned} \end{aligned}                                                         ....(2)

From (1) and (2) clearly f\; o\; g\neq g\; o\; f

Hence, they are not equal functions.

Posted by

infoexpert23

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

PM Modi's Pariksha Pe Charcha 2025 to be held next month, registrations open till January 14
anam-khan

CBSE Board Exams 2025: Online portal for availing exemptions by CWSN students opens
anam-khan

Board Exams: States agree to equivalence; no question paper ‘jumbling’ from next year, says PARAKH CEO

Latest Question