Question 1204119
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<pre>

{{{sin(3pi/2)}}} = -1.    <U>ANSWER</U>


    It is a Table angle (= the angle from the Table).


       +----------------------------------------------------------------+
       |    So the value of sine of this angle can be considered as     |
       |  a PRIMARY information, similar to an axiom of parallel lines. |
       +----------------------------------------------------------------+


       (Same as the case  2 x 2 = 4  from the multiplication Table).


    Double angle identity is IRRELEVANT.
</pre>

Solved.


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<H3>The conclusion</H3

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A request in this post is semi-idiotic.



P.S. &nbsp;&nbsp;Above, &nbsp;I used the term &nbsp;"semi-idiotic" &nbsp;to make my statement as &nbsp;" soft " &nbsp;as possible.


Without this softening, &nbsp;the statement is &nbsp;" A request in the post is idiotic ". &nbsp;&nbsp;&nbsp;100% &nbsp;true.