Question 610652
In quadrant 2 the tan is negative because you have
(+) / (-) = (-) 
The sin is y component over the radius
You need to find the length of the x-component
{{{ x^2 = 13^2 - 12^2 }}}
{{{ x^2 = 169 - 144 }}}
{{{ x^2 = 25 }}}
{{{ x = 5 }}}
{{{ tan( x ) = -12/5 }}}
{{{ tan (x) = -2.4 }}}
Hope this isn't confusing- I used {{{x}}} for 2 different things:
the needed angle and also the x-axis length. Sorry