<u>Answer:</u>
csc = 5/4
<u>Step-by-step explanation:</u>
Assuming that the two given points 3/5 and 4/5 are the two sides of a triangle and a right angle 0 with legs x and y and z as its hypotenuse.
Then using Pythagoras Theorem:





Taking square root on both the sides:

Now, 
and we know that 
Therefore, csc = 5/4.
The differnce of 2 perfect cubes
remember
a³-b³=(a-b)(a²+ab+b²)
so
No because the stupidity of you can not calculate