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Calculus
Internals

Trigonometry

Practice 1     Practice 2     Practice 3

Practice 4     Practice 5     Practice 6

Sheets focusing on the Achieved and Merit for writing and solving Trig Equations. Numbers 3 and 6 focus on general solutions.
 
Extension Practice

A sheet on the use of Trig Identities in the context of problems.
 

Conics

There are a number of my videos on the videos page, showing the key methods.
 

Simultaneous Equations

Practice 1     Practice 2     Practice 3

Practice 4     Practice 5     Practice 6

Worksheets with a couple of exercises at each level.
 

Flatworldknowledge has examples, exercises, and good pictures of the three dimensional situations leading to inconsistent and dependent solutions. (It may take some time to load.)
 

Why U's YouTube video is another explanation.
 

Finally, this is quite a good explanation of the process for solving 3 x 3 equations by hand from http://www.slideshare.net


 

Linear Programming

This topic is done as part of the Statistics Course at St John's, although technically in the Calculus set of standards.

Practice 1     Practice 2

Practice 3     Practice 4

Worksheets, with an Achieved example first, followed by a Merit/Excellence example. The later ones are harder.