Yes, 355÷113 is very close to π, but is not equal to π
So how does it get things 'right' for cos(355÷113), but not right for sin(355÷113)?
And why is the error of π-355÷113 exactly the same as the error of sin(355÷113)?
I sense some fuckiness of how they handle π...
Note, I edited my comment. Now I'm reminded of when I tested engineering grade rulers against each other like 25 years ago and nothing perfectly matched.. ☹️