Pre-Calculus

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

(a) Find the x-intercepts of the graph of
y = f(x).

(b) Find the y-intercepts of the graph of
y = f(x).

(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)

(d) Find the relative extrema of the graph of
y = f(x).

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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

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2. 9 8

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3. −2π to 2π where f(x)=cosx

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