Posted by **Anonymous** on Thursday, November 18, 2010 at 8:51am.

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 -
**Reiny**, Thursday, November 18, 2010 at 10:18am
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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