<PRE><B>Question 811280</B>
Find the exact value of the expression. 
arctan(tan 5&amp;#960;/7)
Reads:The tan of an angle whose tan=5&amp;#960;/7
So,arctan(tan 5&amp;#960;/7)=5&amp;#960;/7
..
Similarly, arcsin(sin30&amp;#730;)=30&amp;#730;
arcsin(sin30&amp;#730;)=arcsin(1/2)=30&amp;#730;
or
arccos(cos(x))=x 
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