**Find the exact value of the expression without using a**

x=arctan(-1) tanx=-1 Think of where on the unit circle is tangent of some angle equal to -1. x=(-pi)/4+pin... Without calculator C = arctan(3) + arcsin(5/13) find cos(C) Let A = arctan(3) which means tan(A) = 3 So we draw a right triangle that has angle A. Since the tangent is opposite/adjacent and since tan(A) = 3/1 we will make the opposite side 3 and the adjacent side 1 so that tan(A) = 3/1.

**Atan2 Calculator Easycalculation.com**

Find the atan 2 value with this calculator. Code to add this calci to your website Just copy and paste the below code to your webpage where you want to display this calculator.... 25/07/2004Â Â· I'm as calculator dependent as the next guy, so here is a fairly rough way to do it (assuming you've memorized the basic angles 0, 30, 45, 60, 90). 50/30 or 5/3 is â€¦

**Find arctan(3/2) without calculator The Student Room**

7/09/1999Â Â· What I haven't seen yet is how computers calculate the inverse tangent. So those are the three methods I know of: - Ptolemy's method of building a table using half-angle and sum and difference formulas; - the Taylor series method to calculate one sine or cosine with a nice formula; - the CORDIC method that calculators use. I still prefer a calculator or a table, but it is satisfying to know... 10/12/2013Â Â· Without a calculator? I am giving you the value of pi and will calculate a little bit (arctan infinite series, but with a small value, not -4/3). I am giving you the value of pi and will calculate a little bit (arctan infinite series, but with a small value, not -4/3).

**Math Forum Discussions Re arctan with Windows calculator**

11/06/2007Â Â· On Thu, 7 Jun 2007, ronviers@gmail.com wrote: > My RPN calculator does not have trig functions so I am trying to use > the Windows calculator and I am having trouble with simple data entry.... The value square root of 3 is a value of a special triangle measuring 30-60-90. In this case, we are familiar that the sin of 60 degrees is equal to square root of 3 over 2. and that the cosine of 60 degrees 0.5. tangent is sine over cosine, hence square root of 3 is equivalent.

## How To Find Arctan Without Calculator

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## How To Find Arctan Without Calculator

### By convention, the range of arcsin is limited to -90Â° to +90Â°. So if you use a calculator to solve say arcsin 0.55, out of the infinite number of possibilities it would â€¦

- 26/02/2008Â Â· Well, memorizing it to 5 or so digits isnt that hard (I know 15 just in case =] ) and in fact it may be easier to remember than any other method of getting the number on your calculator.
- 26/02/2008Â Â· Well, memorizing it to 5 or so digits isnt that hard (I know 15 just in case =] ) and in fact it may be easier to remember than any other method of getting the number on your calculator.
- Online arctan(x) calculator. Inverse tangent calculator.Enter the tangent value, select degrees (Â°) or radians (rad) and press the = button. Inverse tangent calculator.Enter the tangent value, select degrees (Â°) or radians (rad) and press the = button.
- The value square root of 3 is a value of a special triangle measuring 30-60-90. In this case, we are familiar that the sin of 60 degrees is equal to square root of 3 over 2. and that the cosine of 60 degrees 0.5. tangent is sine over cosine, hence square root of 3 is equivalent.

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