Home
Class 12
MATHS
Let f: RrarrR and g: RrarrR be two fun...

Let `f: RrarrR` and `g: RrarrR` be two functions such that `fog(x)=sinx^2a n dgof(x)=sin^2x` Then, find `f(x)a n dg(x)dot`

Text Solution

Verified by Experts

Given, `(fog)(x) = sin x^2 and (gof)(x) = sin^2 x`

` f(g(x)) = sin(x^2) & g(f(x)) = (sin x)^2` ...(1)

Clearly, `f(x) = sin x & g(x) = x^2` satisfies both conditions of (1)

So,`f(x) = sin x and f(x) = x^2`
Promotional Banner

Topper's Solved these Questions

  • DIRECTION COSINES AND DIRECTION RATIOS

    RD SHARMA|Exercise Solved Examples And Exercises|67 Videos
  • HIGHER ORDER DERIVATIVES

    RD SHARMA|Exercise Solved Examples And Exercises|176 Videos

Similar Questions

Explore conceptually related problems

Let f : R rarr R and g : R rarr R be two functions such that fog (x) = sin x^(2) and gof (x) = sin^(2)x . Then , find f(x) and g(x).

Let f:R rarr R and g:R rarr R be two functions such that (gof)(x)=sin^(2)x and (fog)(x)=sin(x^(2)) Find f(x) and g(x)

If f: R->R and g: R->R be functions defined by f(x)=x^2+1 and g(x)=sinx , then find fog and gof .

Let f:RrarrR and g:RrarrR be two functions defined by f(x)=|x| and g(x)=[x] , where [x] denotes the greatest integer less than or equal to x. Find (fog) (5.75) and (gof) - (-sqrt(5)) .

If f,g:R rarr R be two functions defined as f(x)=|x|+x and g(x)=|x|-x. Find fog and gof.Hence find fog(-3), fog (5) and gof(-2).

Let f and g be two differential functions such that f(x)=g'(1)sin x+(g''(2)-1)xg(x)=x^(2)-f'((pi)/(2))x+f''((-pi)/(2))

RD SHARMA-FUNCTION-Solved Examples And Exercises
  1. Let f={(3,1),(9,3),(12 ,4)} and g={(1,3),(3,3),(4,9),(5,9)}dot Show th...

    Text Solution

    |

  2. If F :[1,oo)vec[2,oo) is given by f(x)=x+1/x ,t h e nf^(-1)(x) equal...

    Text Solution

    |

  3. Let f: RrarrR and g: RrarrR be two functions such that fog(x)=sin...

    Text Solution

    |

  4. Let R be the set of real numbes. If f: RvecR ;f(x)=x^2 and g: RvecR ;g...

    Text Solution

    |

  5. If f(x)=-4-(x-7)^3 , write f^(-1)(x)dot

    Text Solution

    |

  6. If f:{5,6}vec{2,3}a n dg:{2,3}vec{5,6} are given by f={(5,2),(6,3)} an...

    Text Solution

    |

  7. If a function g={(1,1),(2,3),(3,5),(4,7)} is described by g(x)=alphax+...

    Text Solution

    |

  8. Show that f: R-[0]vecR0[0] given by f(x)=3/x is invertible and it is i...

    Text Solution

    |

  9. Let A={1,2,..., n} and B={a , b }. Then number of surjections from A...

    Text Solution

    |

  10. If f: Rvec(-1,1) is defined by f(x)=-(x|x|)/(1+x^2),t h e nf^(-1)(x) e...

    Text Solution

    |

  11. Let f: ZvecZ be defined by f(n)=3n for all n in Z and g: Zvec be defi...

    Text Solution

    |

  12. Let A={x in R :0lt=xlt=1}dot If f: AvecA is defined by f(x)={x ,ifx Q...

    Text Solution

    |

  13. Let A=[-1,1]dot Then, discuss whether the following functions from A t...

    Text Solution

    |

  14. Let R be a relation on the set A of ordered pairs of positive integ...

    Text Solution

    |

  15. Let A be a finite set. If f: AvecA is an onto function, show that f is...

    Text Solution

    |

  16. Show that the function f: R-{3}->R-{1} given by f(x)=(x-2)/(x-3) is ...

    Text Solution

    |

  17. Show that the function f: Rvec given by f(x)=x^3+x is a bijection.

    Text Solution

    |

  18. Let f: Nuu{0}vecNuu{0} be defined by f{n+1,if n is even n-1,if n is od...

    Text Solution

    |

  19. Let f: N-[1]vecN be defined by, f(n)= the highest prime factor ofn . S...

    Text Solution

    |

  20. Let A={1,2} . Find all one-to-one function from A to A.

    Text Solution

    |