Here's the question you clicked on:
fatemah
graph----> y=2sin(x-pi/4)+1
Just try out some values for x and use the (x,y) coordinates to draw dots on these points
Then you can find the minimum/maximum points through the derivative (where the derivitive equals 0)
http://www.wolframalpha.com/input/?i=y%3D2sin%28x-pi%2F4%29%2B1
the sinx curve will be shifted by pi/4 on the x-axis in the left hand side and in the y-axis by +1 above. that's it