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= 1/2 (Min + Max)
= 1/2 (-1/2 + 3/2)
= 1/2 (1)
= 1/2
Koefisien dari cos(ax) adalah:
= 1/2 (Max - Min)
= 1/2 (3/2 - (-1/2))
= 1/2 (2)
= 1
Periodanya adalah 4π
a = 2π/(4π)
a = 1/2
Sehingga persamaan:
y = [Koef cos(ax)]cos(ax) + Konstanta
y = 1.cos(1/2 x) + 1/2
y = 1/2 + cos 1/2 x [B]