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Nazyma

  • 3 years ago

PLEASE HELP ME!!!!!!! REALLY IMPORTANT!!!!!!!!! y = −5 cos x On what intervals within [0, T) is f increasing? (T is the period of the function. Enter your answer using interval notation. If an answer does not exist, enter DNE.)

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  1. ggrree
    • 3 years ago
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    hm. have you learned derivatives yet?

  2. Nazyma
    • 3 years ago
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    not yet(

  3. Nazyma
    • 3 years ago
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    That's the graph http://www.wolframalpha.com/input/?i=y%3D-5cos%28x%29

  4. ggrree
    • 3 years ago
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    ok, so all you have to do is draw out the function and I guess just look at it.

  5. ggrree
    • 3 years ago
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    yeah, good.

  6. Nazyma
    • 3 years ago
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    yes, but can you plz exactly say where it is increasing?

  7. ggrree
    • 3 years ago
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    notice that it starts at -5, right? it keeps going up from there. it's still moving up once it crosses the x axis.

  8. ggrree
    • 3 years ago
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    once it hits pi, it starts to move down instead.

  9. ggrree
    • 3 years ago
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    therefore your answer is [0, pi]. hopefully that helped.

  10. Nazyma
    • 3 years ago
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    oh, thanks so much)

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