Posted by bob on Sunday, November 4, 2012 at 10:44pm.
I need to use calculus to solve this word problem:
Find all maximum and minimum values for f(x)= sin(x)+ cos(x) on [0, 2(3.14)]
How do I do it?

math  Reiny, Monday, November 5, 2012 at 12:31am
f(x) = sinx + cosx , 0 ≤ x ≤ 2π
f ' (x) = cosx  sinx
= 0 for a max/min
cosx  sinx = 0
sinx = cosx
sinx/cosx = 1
tanx = 1
x = 45° or 225°
x = π/4 or x = 5π/4
f(π4) = √2/2 + √2/2 = √2
f(5) = √2/2  √2/2 = √2
the max is √2, the min is √2
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