Function a)
Maximum = 2 , Minimum = -2
Amplitude= 4/2= 2
y = A• Cos ( ? )
When x= 2/3π y = 0
π/2 - 2/3π = π•(1/2 - 2/3)
Then
y= A• Cos ( X - π/6 )
y= 2• Cos (X - π/6 )
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Function b
Maximum = 4, Minimum= 2
Amplitude A= 2/2= 1
y= A• Sin (?)
When x= -π/3,. y = 2
Then
y = A• Sin( X + π/3 ) + 2
y = Sin (X + π/3 ) + 2