Question 559304
300 degrees is in the 4th quadrant where
the Sine is always negative.
If you drop a vertical to the horizontal axis,
it forms a 60 degree angle with the horizontal.
That is because there is 60 degrees left to go
360 degrees, or full circle.
The sine of 60 degrees in the 4th quadrant 
is {{{ sin(300) = -sqrt(3)/2 }}}