Pre-Calculus

f(x) = cos(x)
on the interval [−2π, 2π]

(a) Find the x-intercepts of the graph of
y = f(x).
(Enter your answers as a comma-separated list.)

(b) Find the y-intercepts of the graph of
y = f(x).
(Enter your answers as a comma-separated list.)

(c) Find the intervals on which the graph of
y = f(x)
is increasing and the intervals on which the graph of
y = f(x)
is decreasing. (Enter your answers using interval notation.)

(d) Find the relative extrema of the graph of
y = f(x).
(Enter your answers as a comma-separated list of ordered pairs.)

  1. 👍
  2. 👎
  3. 👁
  1. (a) surely you know where cos(x) = 0
    (b) surely you can determine cos(0)
    (c) check the graph below
    (d) surely you know the min and max of cos(x)

    graph at

    http://www.wolframalpha.com/input/?i=cos%28x%29

    1. 👍
    2. 👎
  2. 9 8

    1. 👍
    2. 👎
  3. −2π to 2π where f(x)=cosx

    1. 👍
    2. 👎

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