4)+Important+Identities


 * INTRODUCTION **

Before you start learning trigonometry, it is extremely recommended to learn the following identities, as you will be using them all the time. Well, most of the time, but you get what I mean. Therefore, it is of utmost importance you remember these identities, as with the algebraic identities. There identities will serve you well. Enjoy!


 * RECIPROCAL IDENTITIES **




 * PYTHAGORAS' IDENTITY **




 * IDENTITIES EXPRESSING TRIGONOMETRIC FUNCTIONS IN TERMS OF THEIR COMPLEMENTS **


 * Sine and Cosine || [[image:CodeCogsEqn.gif]] || [[image:CodeCogsEqn(2).gif]] ||
 * Tangent and Cotangent || [[image:CodeCogsEqn(3).gif]] || [[image:CodeCogsEqn(4).gif]] ||
 * Secant and Cosecant || [[image:CodeCogsEqn(5).gif]] || [[image:CodeCogsEqn(6).gif]] ||