csc[sin-1()] This asks the question: What is the cosecant of the angle whose sine is ? Since you know that the cosecant is the reciprocal of the sine, then since the sine is , its cosecant is the reciprocal of that, so it's . Or you can rationalize the denominator and get . Edwin
a3/2b3c5 —————————...(answered by AnlytcPhil)