Question 535927
{{{sin (theta)  = 3/5}}}
For any angle
{{{(sin (theta))^2+(cos (theta))^2=1}}},
so if {{{cos (theta)<0}}},
then {{{cos (theta)=-4/5}}}
and {{{cot (theta)=cos (theta)/sin (theta)=(-4/5)/(3/5)=-4/3}}}