+129852 The midline is the same as with the "regular" sine curve....we would have to have a plus or minus added to the function to affect the normal midline of y = 0
The only thing tricky about this one is that it is a "compressed" sine curve wth a "phase shift"
Note that we can write this in the following manner
f(x) = sin (2pi ) ( x - 1/4)
This says that there are 2pi periods in 2pi rads....so .....every period = 1 (rad)
Also.....the regualr sine curve is shifted 1/4 rads to the right
Look at the regular sine curve and this function on the same graph :
https://www.desmos.com/calculator/itkg2m4xrj
Note that the point (.25,0) "starts" the shifted curve and the point (1.25, 0) completes the period......
Also note that the curve is shifted (1/4) rad to the right of the regular curve
+1995 
ops i head said the midline opposite, I meant to write (0.25,0) , my mistake.
I have though attached what you have explained and created it, is this correct?(:
