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December 20, 2014

December 20, 2014

Posted by **corie** on Friday, February 8, 2013 at 4:15pm.

I just don't get these!

- maths- preferably Steve -
**corie**, Friday, February 8, 2013 at 4:16pmcan someone help me?

- maths -
**Steve**, Friday, February 8, 2013 at 4:30pmjust use your calculator for the arctan function. Or, go to

http://www.rapidtables.com/calc/math/Arctan_Calculator.htm

and enter 73 and get arctan(73) = 89.22°

so, tan(89.22°) = 73

just think of the trig functions as another set of functions and inverses

If I say x^2 = 4 you apply the inverse of ^2 to get x = √4 = 2

If √x = 4, apply the inverse to get x = 4^2

so, if you want sin(30) you get 1/2

If you want to find what angle has cos(x) = 1/2, apply arccos(1/2) = 60

- maths -
**Damon**, Friday, February 8, 2013 at 4:32pmWell, I am not Steve but I do have a calculator.

- maths -
**Damon**, Friday, February 8, 2013 at 4:33pmOh, never mind, Steve answered while I was looking for an online calculator :)

- maths -
**Corie**, Friday, February 8, 2013 at 4:34pmso the answer is 89.22? sorry I hope I don't sound dumb but I don't understand trig AT ALL.

- maths -
**Corie**, Friday, February 8, 2013 at 4:38pmthanks anyways Damon :) and thanks Steve

- maths -
**Steve**, Friday, February 8, 2013 at 4:38pmThink of a right triangle with the bottom leg 1 and the side leg 73. It is very tall and skinny. The base angle is very close to 90 degrees. If that angle is x, then tan(x) = 73.

Go back to basics and start looking at right triangles to see how the trig functions are defined. Whenever you're stuck on some trig idea, always try to see how it relates to a right triangle. Draw lots of them. Read articles online; there are lots of different approaches to show how they work.

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