75 deg. = 75(π/180) radians 75 deg. = 75π / 180 radians don't bother to try and simplify π (it is an irrational number) however you can simplify 75/180 both are divisible by 5 75π/180 = 15π/36 both are divisible by 3 75 deg. = 5π/12 radians
We normally don't bother to go further, unless you actually need it as a decimal fraction (in which case, you will have an approximation)