Question 1085771
{{{ 320 }}} degrees is a full circle minus {{{ 40 }}} degrees
{{{ 320 = 360 - 40 }}}
So, I can say:
{{{ sin( 320 ) = sin( -40 ) }}}
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The sine function in the 4th quadrant, where -40 degrees is,
is negative. 
The sine function in the 1st quadrant , where 40 degrees is,
is positive
I can say:
{{{ sin(-40) = -sin(40) }}}
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You can dtermine this on a calculator