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Nazyma

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.)

  • 2 years ago
  • 2 years ago

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  1. ggrree
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    hm. have you learned derivatives yet?

    • 2 years ago
  2. Nazyma
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    not yet(

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

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

    • 2 years ago
  5. ggrree
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    yeah, good.

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

    • 2 years ago
  7. ggrree
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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.

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

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

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

    • 2 years ago
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