Question 924795
 <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi
sin( 7&#960;/12) = (1/4)(&#8730;2 + &#8730;6) is the exact value representation of sin( 7&#960;/12)
that allows one to express sin( 7&#960;/12) in terms of <u>simple square roots</u> rather 
than in using a decimal representation derived from a calculator.
...
Although calculators use irrational numbers such as &#960;, &#8730;2 ,&#8730;3 etc...
the decimal calculations are never 'exact' (...best we can do is a 'rounded off' representation)
...........
&#952;	radians	sin &#952;	cos &#952;	tan &#952;
0°	0	0	1	0
30°	&#960;/6	1/2	&#8730;3/2	&#8730;3/3
45°	&#960;/4	&#8730;2/2	&#8730;2/2	1
60°	&#960;/3	&#8730;3/2	1/2	&#8730;3
90°	&#960;/2	1	0	&#9472;