Instructions: Find value of Expression to nearest four significant digits.

tan 100°

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- Feb 10th 2009, 02:52 PMRaphaelB30[SOLVED] How do I find tan?
Instructions: Find value of Expression to nearest four significant digits.

tan 100° - Feb 10th 2009, 02:56 PMJameson
Can you use a calculator? There are many approximation methods, the most common I think to use for this would be the Taylor series for tangent.

- Feb 10th 2009, 03:02 PMRaphaelB30
Is there a simpler way or is calculator the easiest method?

- Feb 10th 2009, 03:06 PMJameson
I really don't know how your teacher wants you to do this. You could use the difference formula for tan(120-20) since 120deg = (2pi)/3 and 20deg=pi/9. Have you guys been doing angle sums in class?

edit: If you can't give some sort of direction then it won't be able to fully help you as like I said there are many ways to approximate trig functions. I can help you but I need info. - Feb 10th 2009, 03:26 PMRaphaelB30
ok, I found the tan of 120deg, but how do I find the tan of 20deg?

Edit: Yes. I believe I am learning angle sums. - Feb 10th 2009, 03:52 PMskeeter
- Feb 10th 2009, 03:55 PMJameson
Haha thanks skeeter. To be honest I am blanking on a way to find tan20 by hand. I'm sure others know. Be patient.

- Feb 10th 2009, 03:58 PMRaphaelB30
- Feb 10th 2009, 04:00 PMJameson
If doing this by hand, you have to figure out a way to express tan20, which I can't think of right now.

- Feb 10th 2009, 04:00 PMRaphaelB30Never Mind
This problem wasn't intended to be that difficult. I think it

*was*looking for the calculator way. Thanks very much Jameson and Skeeter.