csc=hypotenuse / opposite of the right angle=sec(pi/2-42)=1/sin42
Using a calculator-make sure it is set to deg. Look at the top of the screen and it should say DEG and not RAD
input 42
Push "csc"
csc42degrees=1.49
The other option is to use a standard trig chart
http://math2.org/math/trig/tables.htm
Find the csc for 42 degrees