Question 919801
{{{sec(A)=sqrt(5)}}}
So,
{{{1/cos(A)=sqrt(5)}}}
{{{cos(A)=1/sqrt(5)}}}
{{{cos(A)^2=1/5}}}
But you know that,
{{{cos^2(A)+sin^2(A)=1}}}
{{{1/5+sin^2(A)=1}}}
{{{sin^2(A)=4/5}}}
{{{sin(A)=0 +- 2/sqrt(5)}}}
So then,
{{{csc(A)=0 +- sqrt(5)/2}}}