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We first start with the graph of the basic sine function f (x) = sin (x) The domain of function f is the set of all real numbers. The range of f is the interval [-1,1]. -1 <= sin (x) <= 1 (<= means less than or equal) Also function f is periodic with period equal to 2p. The graph of f over one period can be sketched by first finding points that give important information such as x intercepts, y intercept, maxima and minima. Let us make a table of values for function f over the interval one period: [0 , 2p]. x 0 p/2 p 3p/2 2p f (x) 0 1 0 -1 0 The choice of the values of x in the table correspond to x and y intercepts, maxima and minima points. These are useful points to graph the sine function over one period: [0 , 2p]. To graph f, we first graph the points in the table then join these points. Of course you may add extra points if you wish. But the five points used are key points. Another important point to note is that the 5 key points divide the period into 4 equal parts.
this is a review
@dpalnc I still havent quite understand the way you do it. Can u explain briefly.
hi, do you know where the 2 and the 6 came from?
Yea. I know. But How do you determine whether its "<" or ">".
ok. so would you agree that if I plug in any OTHER number different from 2 or 6 the value of (p-2)(p-6) will either be positive or negative?
so, all I'm concerned with is the sign ("+" or "-") of (p-2)(p-6) when I stick in numbers other than 2 or 6. for example if I pick a number like p=0, then (0-2)(0-6) = (-2)(-6) =6 which is positive. that's why you see a plus sign to the left of 2. if I pick a number between 2 and 6, say p=4, then (4-2)(4-6) = (2)(-2) = -4, negative. so you see a minus sign where 4 lies. then you do that with the other interval and you'll see you'll get a positive sign.
|dw:1333175232760:dw| > 0 means positive < 0 means negative
Thank you! I get it now. :D