Question 1085769
{{{ -400 = -360 - 40 }}}
{{{ sin( -400 ) = sin( -40 ) }}}
In the 4th quadrant, the sine function is negative
In the 1st quadrant, the sine function is positive
{{{ sin(-40) = -sin(40) }}}
and, from my 2nd line here:
{{{ sin(-400) = -sin(40) }}}