See The Method of Partial Fractions, from S.O.S. MATHematics.
Also see The Method of Partial Fractions, from the Review of Algebra Techniques, part of Oregon State University's extensive Web Study Guide project.
The University of Saskatchewan's Exercises in Math Readiness (EMR) site has a section on Partial Fraction Decompositions. Included are an introduction and three sets of exercises : Introductory, Moderate, and Advanced. Recommended.
See Solving Absolute Value Inequalities, from the University of Wisconsin Marathon Center's Notes for College Algebra and Geometry.
Also see Inequalities and Graphical Methods for Solving Inequalities, both from the University of Saskatchewan's Exercises in Math Readiness (EMR) site.
For an introduction to radicals, see Square Roots and Other Radicals, from Exercises in Math Readiness (EMR).
See The On-Line Encyclopedia of Integer Sequences. Among other topics, this interesting site discusses "puzzle" sequences, "classic" sequences, and "hot" sequences. Recommended.
A proof of the principle of mathematical induction may be found at
Countable Infinity.
Explanations are given at Mathematical Induction and
Mathematical Induction, two different sites with the same name.
The (Combinatorial) Object Server covers a wide number of subjects, including Information on Permutations and Information on Combinations of a Set.
The Combinatorics site provided by Oberlin College has
chapters (with exercises) on
The Multiplication Principal, Permutations
and Combinations.
Recommended.
For challenging questions, see the problem sets in Combinatorics Topics for K-8 Teachers.
Also see Thoughts on teaching Permutations, Combinations and the Binomial theorem.
See Arithmetic Properties of Binomial Coeffiecients.
Also see Expanding Binomials, from Exercises in Math Readiness (EMR).
Simple trigonometric equations are dealt with at Trigonometric Equations, from the University of Texas El Paso's S.O.S. MATHematics site.
. The terms complex
number, real part and imaginary part, conjugate, modulus and argument.
The complex plane (Argand diagram).See The Complex Plane, from S.O.S. MATHematics.
See
The Polar Form of a Complex Number : The unit circle,
from S.O.S. MATHematics.
De Moivre's theorem is mentioned.
The same site has an explanation of eiq = cos q + i sin q. See Euler's Formula.

For background material, see
The Polar Form of a Complex Number : The unit circle.
Proof of the theorem
(cos q + i sin q
)n = cos n q + i sin n
q is left as an exercise.

Polynomial equations are discussed at Polynomials and Roots, from the University of Saskatchewan's Exercises in Math Readiness (EMR). The Advanced Exercises require the solution of equations having radicals as coefficients.
