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all right please listen up what I'd like
you to do is if you look over here guys
all they're asking us to do is find a
period in amplitude that's it so we just
need to remember what our definitions
were for the period and the amplitude so
the period all actually let's look at
Matthew first the amplitude all that is
is the absolute value of a all right now
if we don't know what a is we need to go
back and think the general formula of
the function which is in your book says
eight I'm sine of BX minus C plus D all
right where each one of these numbers
for these coefficients are all integers
all real numbers so a is going to be my
number that's in front of sine so I go
and take a look so my amp dude is going
to be the absolute value of 3 so
absolute value 3 is obviously going to
be 3 so therefore my amplitude
equals 3 all right yes
exactly so if it was negative three
after bad negatory still three yeah
that's a CW amplitude chose day right
pretty much except if it's negative
that's a guy now period is going to get
a little more difficult for this one is
costume Abner period is 2pi divided by b
so we look at Hartwell what does B well
B is going to be our number that we can
directly put in front of X well we look
in this problem in our numbers two so
it's going to be two PI over 2 of them
well those can cancel out so we're just
left with okay and we're going to talk
more about what the period in amplitude
are in second but the poor part we know
to find them is really really important
you guys to be only crap that's the
formula I told you
![PreCalculus - Trigonometry (43 of 54) Find the Amplitude, Period, and Graph y=cos[x-(pi/2)]](https://i.ytimg.com/vi/kiMcanMKgn0/mqdefault.jpg)
