Question
For x ∈, (0, 5π/2) define f(x). Then f (x) = 
has
-
local maximum at π and 2π.
-
local minimum at π and 2π
-
local minimum at π and the local maximum at 2π.
-
local maximum at π and local minimum at 2π.
Solution
D.
local maximum at π and local minimum at 2π.
local maximum at π
and local minimum at 2π
are not perpendicular and 
are two vectors satisfying: 
The vector 
is equal to
