# Thread: how to find equation?

2. ## Re: how to find equation?

looks like a basic sine wave with amplitude of 175 and period of 50 ...

$V(x) = 175\sin\left(\frac{\pi x}{25}\right)$

3. ## Re: how to find equation?

Originally Posted by skeeter
looks like a basic sine wave with amplitude of 175 and period of 50 ...

$V(x) = 175\sin\left(\frac{\pi x}{25}\right)$

How did you get the period of pi/25??
isn't the period 50?

4. ## Re: how to find equation?

did you not read the first line in my post?

looks like a basic sine wave with amplitude of 175 and period of 50 ...
fyi, $\frac{\pi}{25}$ is not the period ...

I recommend you research the role of the value $B$ in the equation $y = A\sin(Bx)$.

5. ## Re: how to find equation?

Originally Posted by skeeter
did you not read the first line in my post?

fyi, $\frac{\pi}{25}$ is not the period ...

I recommend you research the role of the value $B$ in the equation $y = A\sin(Bx)$.
nvm got it, lol, 2pi/50 is B, correct?

6. ## Re: how to find equation?

Originally Posted by ahmedb
nvm got it, lol, 2pi/50 is B, correct?
that's what my post stated.

7. ## Re: how to find equation?

Originally Posted by skeeter
that's what my post stated.
yep, thanks alot!! any "like" or thanks button on this forum?

8. ## Re: how to find equation?

how can you convert it to cos?

9. ## Re: how to find equation?

Pretty simply. $sin(u) = cos\left(\frac{\pi}{2} - u\right)$