What is the right choice for question 3) ?
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General formula for graphs of sine are: `y= Asin(Bx-C)+D`
A: amplitude(vertical stretch) ; B: B=`(2pi)/P`
C: phase shift `C/B`
D: vertical shift
therefore amplitude (A) gives us y = 2sin, B is `(1)/(2)`
C is `pi/8`
because `pi/4-: 1/2=pi/8`
D is 1
therefore the correct equation is: `y=2sin(x/2 -pi/8) + 1`
which indicates choice "d"
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