Unfortunately, it is not possible for us to fill in the gaps in pre-calculus math. in this course and therefore you will have to review your trig. and basic function theory on your own. A fair site on the Internet where this can be done can be found at the University of Saskatchewan's Math. Readiness Site, reproduced below... where all sorts of deficiencies in pre-calculus math. can be tested. Perhaps all the sections should be tried there beginning with the Introductory level exercises and proceeding to the more advanced ones.