# trignometry

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• Nov 25th 2008, 05:42 AM
elephunk
trignometry
Hi,

I have my calculator in radians. I just need to know what to put in. I tried doing this but values I was getting didn't seem right.

Any help with this would be greatly appreciated.

Thanks
• Nov 25th 2008, 08:52 AM
masters
Quote:

Originally Posted by elephunk
Hi,

I have my calculator in radians. I just need to know what to put in. I tried doing this but values I was getting didn't seem right.

http://i45.photobucket.com/albums/f9...lles/table.jpg

Any help with this would be greatly appreciated.

Thanks

I checked the values already listed in the table and they were correct. Here is one of them:

$y=5-3\sin\left(\frac{\pi t}{6}+\frac{\pi}{4}\right)$

If t = 4,

$y=5-3\sin\left(\frac{4\pi }{6}+\frac{\pi}{4}\right)=4.22354265\approx 4.22$

Be sure you entered correctly in your calculator. Here is the sequence for the one I just did.

$5 - 3 sin((4 \pi / 6 + (\pi / 4))$

• Nov 25th 2008, 10:31 AM
elephunk
Okay, So for 3.0 on the first table it would be something like this?

$5 - 3 sin((4 \pi / 6 + (\pi / 4))$

Do I do the same thing for the second table? The value for 24.0 is 2.88 which is totally different.

Thanks
• Nov 25th 2008, 10:59 AM
masters
Quote:

Originally Posted by elephunk
Okay, So for 3.0 on the first table it would be something like this?

$5 - 3 sin(({\color{red}3} \pi / 6 + (\pi / 4))$

Do I do the same thing for the second table? The value for 24.0 is 2.88 which is totally different.

Thanks

You replace t with 3. When you do you get:

$5 - 3 sin(({\color{red}3} \pi / 6 + (\pi / 4))=2.88$

If t=24, then

$5 - 3 sin(({\color{red}24} \pi / 6 + (\pi / 4))=2.88$

Here's your table

(t, y)= (0, 288), (1, 2.10), (2, 2.10), (3, 2.88), (4, 4.22), (5, 5.78), (6, 7.12), (7, 7.90), (8, 7.90), (9, 7.12), (10, 5.78), (12, 2.88), (14, 2.10), (16, 4.22), (18, 7.12), (24, 2.88)
• Nov 25th 2008, 11:26 AM
elephunk
Thanks I was working it out correctly then :)

Just needed to check.

Thanks again :)