1. The problem statement, all variables and given/known data Homework related question:Write the exact value of sin(-270) 3. The attempt at a solution I had this same question before but to write it in approximate value. for an aprox value i simply just plug it into my calculator and get: 1. Pretty exact for an approximate value. When i solve it the exact way. (No calculator) i determine that the Reference angle for -270 degrees is -90 degrees. then i sin -90 degrees and get -1. The answer is 1. I don't understand.