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Calculus
Internals

Trigonometry

Practice 1        Practice 2        Practice 3        pdf files

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        pdf files

Practice 4        Practice 5        Practice 6

Worksheets with a couple of exercises at each level.
 

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