suppose the two points are two side of a triangle and a right angle 0 cosider hypotenuse is z and two sides are x and y using Pythagorean theorem z^2=x^2+y^2 z^2=(3/5)^2+(4/5)^2 z^2=9/25+16/25 z^2=9+16/25 z^2=25/25 z^2=1 taking square root on both sides z=1 now sinθ=4/5/1=4/5 while cscθ=1/sinθ=5/4 hence cscθ=5/4 right option is E. 5/4
