Mathematics of Oblivion

A long time ago, in a galaxy far.extend(chaos), the nines and zeroes gathered.

They spoke in tongues known as Sin(x) + Cos(x) = Done(x), which some say has no solution...

Here's your form, dear solver:

The answer, my friend, is just around the corner:

If today is Monday, proceed with caution; if not, enjoy the ride on the Math Express.