/sci/ - Science & Math

can someone explain how to do this, I'm really lost.

If I remember correcty I place 1 = t
in the 2sin(pi *t)+5cos(pi * t)

And that gets me f(x) and then I do the difference quotient to get a new equation and I then substitute each y value given and take the limit.

I'm getting it wrong though and I don't know why