Posted by Jack on Saturday, September 11, 2010 at 10:59pm.
As x increases from p/4 to 3p/2, the value of sin(x) :
A.increases throughout the interval
B.decreases at first, then increases
C.increases at first, then decreases
D.decreases throughout the interval
E.none of the above
please explain why the answer is as it is, I don't understand this at all, please help :)

Pre Calculus  drwls, Sunday, September 12, 2010 at 7:16am
This only makes sense if your "p" is pi, and x is an angle expressed in radians.
The sin of pi/4 is 0.7071
Then sin x rises to +1 at x = pi/2, and falls to 1 at x = 3 pi/2
The correct answer is therefore C
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