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Mathematics: Post your doubts here!

Discussion in 'International A And AS Level' started by XPFMember, Sep 8, 2011.

  1. insharah

    insharah

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    find the range of f(x)=3-4cos^2 x
    please help
     
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  3. Thought blocker

    Thought blocker

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    Domain? Post d exact question so i can collect all info :)
    I just need domain over here though :)
     
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  4. insharah

    insharah

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  5. Thought blocker

    Thought blocker

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    np :)
    So it is very simple.
    Input d value of domain into d function and respective values will be d value of range.
    here wen u put zero in equation u will get -1
    and wen u put pi in equation u will get 3
    so -1 <= f(x) <= 3 will b d answer :)
     
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  6. insharah

    insharah

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    aaahhh it was so simple
    genius you
    thanks alot buddy!
     
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  7. Thought blocker

    Thought blocker

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    (y)
     
  8. Adeen Atif

    Adeen Atif

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  9. Emmris

    Emmris

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    (i) (6 3/4 ) / (3/8) = 18 classes
    (ii) 3/8 * 28 = 10 1/2 kg
    (iii) 10 1/2 - 6 3/4 = 3 3/4 kg
    (iv) 3/8 * 15 = 5 5/8 kg
    (v) 6 3/4 - 5 5/8 = 1 1/8 kg
     
  10. Emmris

    Emmris

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    Hope it helps :)
     
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  11. Adeen Atif

    Adeen Atif

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    Thanks! :D
    Only one ans is wrong otherwise everything's correct:p
     
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  12. Emmris

    Emmris

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    Oh sorry ...is it the last part dat is incorrect ....
     
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  13. Adeen Atif

    Adeen Atif

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    Nope its the first one..
    No need to be sorry lol. You helped and that was really kind of you :love::D
     
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  14. Emmris

    Emmris

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    Then wats the answer :)
     
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  15. Adeen Atif

    Adeen Atif

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    9/14 :p
     
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  16. Emmris

    Emmris

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    Ah OK :) I just had 2 express it as a fraction ....
     
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  17. Ayesha Asif333

    Ayesha Asif333

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  18. krishnapatelzz

    krishnapatelzz

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  19. Lee Qian Yi

    Lee Qian Yi

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    A die is biased so that the probability that is shows a six on any throw is p. The experiment is repeated and another 97% confidence interval is found. Find the probability that exactly one of two confidence intervals includes the true value of p. ANS :0.0582 How to do ?
     
  20. Thought blocker

    Thought blocker

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    It must be twice the value of 0.03 times 0.97
     
  21. Lee Qian Yi

    Lee Qian Yi

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    Why ?
     

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