Question 1092702
They are saying the sin function is negative, 
so the angle has to be in either the 3rd or 4th
quadrant
The cos is also negative ( {{{ -3/5 }}} ), which puts
the angle in the 3rd quadrant
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{{{ -3/5 }}} for cos means that {{{ theta }}} forms a 3-4-5
triangle,
{{{ tan( theta ) = (-4) / (-3) }}}
{{{ tan( theta ) = 4/3 }}}