Quadratic Trigonometric Equations Solving quadratic trigonometric equations If an equation involves sin2θ or cos2θ then it is a quadratic trigonometric equation These can be solved by factorising a...
Linear Trigonometric Equations Solving linear trigonometric equations You should have already seen two ways to solve linear trig equations By sketching the graph (see Graphs of Trigonometric Functi...
A-level Biology（生物）位列罗素联盟“ facilitating subjects”，是一个很受大学欢迎的A-level科目，大学课程选择和职业选择面很广。 大多数医学、生物、生物医学科科学、牙科、营养学、物理疗法、视觉矫正、兽医...
Trigonometry - Simple Identities What is a trigonometric identity? Trigonometric identities are statements that are true for all values of x or theta (θ) They are used to help simplify trig equatio...
Transformations of Trigonometric Functions Transformations of trigonometric functions You should already have a good idea about translating, stretching and reflecting basic functions (see Transform...
Graphs of Trigonometric Functions Graphs of trigonometric functions The Trigonometric Functions Sin, Cos and Tan all have special periodic graphs that you need to be able to sketch and remember You...
Non-Right-Angled Triangles What do I do if there isn’t a right‑angle? The Sine Rule, Cosine Rule and Area Formula can be used for ANY type of triangle They can help us calculate missing side length...
Right-Angled Triangles What is SOHCAHTOA? SOH, CAH, and TOA are an easy way to remember the three basic trigonometry ratios They show the relationship between an angle and the different sides of a ...
Trigonometry - Definitions What is trigonometry? Trigonometry looks at the relationship between side lengths and angles of triangles It comes from the Greek words trigonon meaning ‘triangle’ and me...
