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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