-1.27 * 57.3 = -73.7451
For your purposes now, it will probably work, but you may regret it later when accuracy is important. To be honest, you could have memorized the right way in the time it took you to read this post. Just remember and
To separate them in your mind, 1 simple rule: radians have in them, so to get out of radians you need to divide out (which means goes in the denominator and 180 in the numerator), to get into radians, you need , so multiply by (meaning in the numerator). Basically just say "do I need or do I need to get rid of " and you can figure it out.