# Monotonicit problem Help please

• Oct 23rd 2012, 07:25 PM
psilver1
Monotonicit problem Help please
So I thought I understood how to do these problems until I got to this one. Could someone explain it to me please.

11) Find the points and state whether it is increasing or decreasing. sint 0 less than or equal to t less than or equal to 2pi
• Oct 23rd 2012, 08:06 PM
chiro
Re: Monotonicit problem Help please
Hey psilver1.

Can you show the full problem in its full detail please?
• Oct 23rd 2012, 08:11 PM
psilver1
Re: Monotonicit problem Help please
Use the Monotonicity Thm to find where the given function is increasing or decreasing

H(t)= sint, 0(<or=) t(<or=)2pi
• Oct 24th 2012, 08:24 AM
hollywood
Re: Monotonicit problem Help please
I've never heard of the monotonicity theorem before, but I probably know it by another name (or perhaps by no name at all).

The derivative of $\sin{t}$ is $\cos{t}$ which is positive for $0 and $\frac{3\pi}{2} and negative for $\frac{\pi}{2}.

- Hollywood