Given 
(a) Find the intervals on which f is increasing or decreasing.
(b) Find the relative maxima and relative minima of f.
a. (a) Increasing on (?6, 6), decreasing on (??, ?6) and (6, ?)
(b) Rel. max. f(6) = 12,
rel. min. f(?6) = ?12
b. (a) Increasing on (?6, 0) and (0,6) decreasing on (??, ?6) and (6, ?)
(b) Rel. max. f(6) = 12,
rel. min. f(?6) = ?12
c. (a) Increasing on (??, ?6) and (6, ?), decreasing on (?6, 0) and (0,6)
(b) Rel. max. f(?6) = ?12,
rel. min. f(6) = 12
d. (a) Increasing on (??, ?6) and (6, ?), decreasing on (?6, 6)
(b) Rel. max. f(?6) = ?12,
rel. min. f(6) = 12
c. (a) Increasing on (??, ?6) and (6, ?), decreasing on (?6, 0) and (0,6)
(b) Rel. max. f(?6) = ?12,
rel. min. f(6) = 12
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