Posted by **Tabby** on Monday, January 10, 2011 at 6:25pm.

Write the equation of the cosine function with an amplitude of 1, a period of 3pi/7, a phase shift of -pi/5, and a vertical shift of 2 units down.

- Trig/Math -
**Reiny**, Monday, January 10, 2011 at 7:02pm
The only actual calculation you have to do deals witht the period.

period = 2π/k

3π/7 = 2π/k

k =

I am also not clear about your information re phase shift,

I will assume that by " a phase shift of -π/5" you mean a shift of π/5 to the left.

If you meant the opposite, just change the sign for the phase shift in my answer.

y = cos(14/3)(Ø + π/5) - 2

- Trig/Math -
**Tabby**, Monday, January 10, 2011 at 7:38pm
i didn't mean to put a negative sign

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