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October 22, 2014

October 22, 2014

Posted by **Kayla** on Thursday, May 17, 2012 at 6:24pm.

- trig -
**Reiny**, Thursday, May 17, 2012 at 6:30pmwhen t=0 , all answers with sin are zero

all answers with cosine are 4, so we eliminate the sine answers

period of a sine or cosine function is 2π/k

but we are told:

2π/k = 2

k = π

so it must be y = 4cos πt

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