# pre-cal

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consider y=-2+5cos(20x-5pie)
the period is?
the frequency is?
the vertical shift is?
the horizontal shift is?

• pre-cal -

more standard form

y = 5 cos 20(x - π/4) - 2

period = 2π/20 = π/10
frequency is 20 cosine curves per 2π radians
vertical shift : 2 units down
horizontal shift: π/4 to the right

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