# Subtracting Pi fractions

• Oct 18th 2009, 01:13 PM
l flipboi l
Subtracting Pi fractions
Hello,

My fractions skills aren't that great, I was wondering if someone could help me figure this out.

I'm trying to graph y=sin1/2(x+pi/4)

I'm stuck the the End Period...

Problem:

How do I subtract this?

(2pi) - (pi/4)

Thanks
-Mark
• Oct 18th 2009, 01:16 PM
skeeter
Quote:

Originally Posted by l flipboi l
Hello,

My fractions skills aren't that great, I was wondering if someone could help me figure this out.

I'm trying to graph y=sin1/2(x+pi/4)

I'm stuck the the End Period...

Problem:

How do I subtract this?

(2pi) - (pi/4) common denominator ... (8pi/4) - (pi/4) = ?

what do you hope to figure out by subtracting $\frac{\pi}{4}$ from $2\pi$ ?
• Oct 18th 2009, 01:18 PM
l flipboi l
Quote:

Originally Posted by skeeter
what do you hope to figure out by subtracting $\frac{\pi}{4}$ from $2\pi$ ?

Thanks....7pi/4, I'm hoping to find the End Period of the graph
• Oct 18th 2009, 01:28 PM
skeeter
Quote:

Originally Posted by l flipboi l
Thanks....7pi/4, I'm hoping to find the End Period of the graph

... the period of

$y = \sin\left[\frac{1}{2}\left(x+\frac{\pi}{4}\right)\right]$

is $4\pi$ , not $2\pi$