Small Angle Approximations Small angle approximations When an angle measured in?radians?is?very small,?you can?approximate?the value using?small angle approximations These?only?apply when angles ar...
Trigonometry Exact Values Exact values In trigonometry some values of sin, cos and tan are “nice” For example?sin 30° = ?,?tan 45° = 1 We can find those associated with the angles?30°,?45°?and?60°?...
Radian Measure Radian measure Radians?are an alternative to degrees for measuring angles 1 radian is the angle in a sector of radius 1 and arc length 1 Radians are normally quoted in terms of π Thi...
Strategy for Trigonometric Equations How to approach solving trig equations You can solve trig equations in a variety of different ways Sketching a graph?(see?Graphs of Trigonometric Functions) Usi...
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）位列羅素聯(lián)盟“ facilitating subjects”，是一個(gè)很受大學(xué)歡迎的A-level科目，大學(xué)課程選擇和職業(yè)選擇面很廣。 大多數(shù)醫(yī)學(xué)、生物、生物醫(yī)學(xué)科科學(xué)、牙科、營(yíng)養(yǎng)學(xué)、物理療法、視覺(jué)矯正、獸醫(yī)...
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 ...
