how do you simplify this code?

the difference between a and b <= c then trade = true, else false..

so far this is what i have made if anyone can show me a shorter way to code this..

if ( a >= b)
{
if (a - b <= c ) trade = true;
if (a - b > c) trade = false;
}
if ( a < b)
{
if (b - a <= c ) trade = true;
if (b - a > c) trade = false;
}