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Which of the following functions is not ...

Which of the following functions is not injective ?

A

f:R→R,f(x)=2x+7

B

`g(x) =x+1/x, x in (0, infty)`

C

f:[0,π]→[−1,1],f(x)=cosx

D

f:R→[−1,1],f(x)=sinx

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-FUNCTIONS -EXERCISE -II
  1. If f:R rarr(0, 1] is defined by f(x)=(1)/(x^(2)+1), then f is

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  2. If f: R to R is defined by f(x)=(x^(2)-4)/(x^(2)+1), then f(x) is

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  3. Which of the following functions is not injective ?

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  4. The function f: R to R defined by f(x) =x-[x], AA x in R is

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  5. f: R^(+) to R defined by f(x) =2^(x) , x in (0,1), f(x) =3^(x), x in [...

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  6. f: R^(+) to R defined by f(x) = log(e)x, x in (0,1), f(x) =2 log(e) x,...

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  7. Statement -I: f: A to B is one -one and g: B to C is a one-one functio...

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  8. Observe the following Lists: Then the match for List -1 from Lis...

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  9. If f(x) =(e^(x) + e^(-x))/2, then the inverse function of f(x) is:

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  10. If f(x) =(10^(x)-10^(-x))/(10^(x) +10^(-x)) then f^(-1)(x)=

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  11. Let f: [1/2, 1] to [-1,1] is given by f(x) =4x^(3)-3x and f^(-)(x) is ...

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  12. The domain fo f(x)=(1)/(|sinx|+sinx) is

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  13. The domain of the function: f(x) =(tan 2x)/(6 cos x + 2 sin 2x) is:

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  14. The domain of the function f(x) = sqrt("cosec"x-1) is:

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  15. If f(x)=|sinx| has an inverse if its domain is

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  16. Domain of sin^(-1) 5x is:

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  17. The doamin of sqrt(1-3x)+Cos^(-1).(3x-1)/(2) is

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  18. Domain of Cos^(-1)sqrt(3x) is

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  19. The domain of the function f(x) =sqrt(sin^(-1)x) is:

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  20. The domain of definition of the function f(x)=sqrt(sin^(-1)(2x)+pi/6) ...

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