Question 920460
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Hi
Need to KNOW: cos (-&#952;) =cos( &#952;)  and sin(-&#952;) = -sin &#952; and tan(-&#952;) = - tan &#952;
cos(-&#960;/4) = cos(&#960;/4)= &#8730;2/2  
csc(-&#960;/4) = 1/cos(&#960;/4)=  2/&#8730;2 = &#8730;2

cot( -&#960;/4 )  = cos (-&#960;/4)/sin(-&#960;/4) = (&#8730;2/2)/(-&#8730;2/2) =  -1
...............
&#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;