# Precalculus

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State the amplitude, period, and phase shift of the function.

h(t)=-9cos(7t-Pie/5)
I got the amplitude and the period. For the phase shift I got (Pie/5)/7 but its wrong. Can someone tell me what I did wrong?

• Precalculus -

h(t)=-9cos(7t-π/5)
or
h(t)=-9cos 7(t-π/35)

the phase shift is π/35 to the right,

your answer of π/5/7 is actually right, except it is not written in good form. It is ambigious, does it mean
(π/5) / 7 or π/(5/7)

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