### MULTIPLE ANGLE

A multiple angle is an angle which is written as a multiple of single function. Example for multiple angles Multiple angle formulas: 1. 2. 3. Question1 : Solve Solution Consider the equation Use the multiple formulae as follow: Written as follows: Set the factors equal to zero as follows: Therefore, the solution is: […]

### Properties of Triangles

BC = a, AC = b and AB = c Area of triangle is denoted by Δ and the radius of the circumcircle by R. Sine Rule : \(\frac{a}{\sin A}=\frac{b}{\sin B}=\frac{c}{\sin C}=2R\) Cosine Rule : $latex \begin{array}{*{35}{l}} {} & \cos A=\frac{{{b}^{2}}+{{c}^{2}}-{{a}^{2}}}{2bc} \\ {} & \cos B=\frac{{{c}^{2}}+{{a}^{2}}-{{b}^{2}}}{2ca} \\ {} & \cos C=\frac{{{a}^{2}}+{{b}^{2}}-{{c}^{2}}}{2ab} \\ \end{array}$ Projection […]