Question 934073
prove:
(sin theta/1-cos theta) - (1/sin theta) = (1/tan theta) 
{{{(sinx/(1-cosx))-(1/sinx)=1/tanx}}}
start with left side:
{{{(sinx/(1-cosx))-(1/sinx)}}}
{{{(sin^2(x)-(1-cosx))/sinx(1-cosx)}}}
{{{(1-cos^2(x)-1+cosx)/sinx(1-cosx)}}}
{{{cosx(-cosx+1)/sinx(1-cosx)=cosx/sinx=1/tanx}}}
Verified: left side=right side