Posted by **jerson** on Thursday, October 16, 2008 at 8:45pm.

for the graph of y=-5sin x/2, state frequency

- trig -
**Reiny**, Thursday, October 16, 2008 at 9:03pm
for y = a sin kx

the period is 2pi/k

so isn't your equation y = -5sin(1/2)x ?

for k = 1/2

can you take it from there?

- trig -
**jerson**, Thursday, October 16, 2008 at 9:04pm
= 1/4?

- trig -
**Reiny**, Thursday, October 16, 2008 at 9:15pm
no, the frequency is 1/2, namely the k value of

y = a sin kx.

for yours, the "period" is 2pi/(1/2) = 4pi

which means it takes 4pi radians on your graph to complete one complete sine curve.

by frequency we want the number of cycles of the sine or cosine curve we would get from 0 to 2pi, which would be 1/2 or the k value of the sin kx .

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