2023年春季SAT机考报名开启，机考考试各部分有哪些变化？
北京时间2022年10月19日，大学理事会(College Board)正式开放SAT机考的国际报名，全新SAT机考的备考资源也已上线。从2023年开始，美国以外的所有SAT考试都将转为机考，美国SAT考试将在2024年全面转为机考。 无论...
Edexcel A Level Maths: Pure:复习笔记5.8.1 Trigonometric Proof
Trigonometric Proof Proving trigonometric identities You can use trigonometric identities you already know to prove new identities Make sure you know the simple trigonometric identities and further...
Edexcel A Level Maths: Pure:复习笔记5.7.1 Strategy for Further Trigonometric Equations
Strategy for Further Trigonometric Equations How to approach solving harder trig equations You can solve harder trig equations, such as those involving reciprocal and inverse functions in a variety...
Edexcel A Level Maths: Pure:复习笔记5.6.3 R addition formulae Rcos Rsin etc
R addition formulae Rcos Rsin etc How can I simplify expressions like a sin x ± b cos x or a cos x ± b sin x? If a and b are positive constants, then a sin x + bcos x can be rewritten as R sin (x ...
Edexcel A Level Maths: Pure:复习笔记5.6.2 Double Angle Formulae
Double Angle Formulae What are the double angle formulae? The double angle formulae are derived from the 'A+B' versions of the compound angle formulae: Exam Tip The double angle formulae are...
Edexcel A Level Maths: Pure:复习笔记5.6.1 Compound Angle Formulae
Compound Angle Formulae What are the compound angle formulae? There are six compound angle formulae (also known as addition formulae), two each for sin, cos and tan: For sin the +/- sign on the lef...
Edexcel A Level Maths: Pure:复习笔记5.5.4 Inverse Trig Functions
Inverse Trig Functions What are arcsin, arccos and arctan? These functions are the inverse functions of sin, cos and tan sin (arcsin x) = x cos (arccos x) = x tan (arctan x) = x The domains of sin,...
Edexcel A Level Maths: Pure:复习笔记5.5.3 Trigonometry - Further Identities
Trigonometry - Further Identities What identities do I need to know with secant, cosecant, and cotangent? There are two identities with sec, cosec and cot that you need to know and be able to use: ...
Edexcel A Level Maths: Pure:复习笔记5.5.2 Reciprocal Trig Functions - Graphs
Reciprocal Trig Functions - Graphs What does the graph of the sec look like? The graph of y = secx looks like this: y-axis is a line of symmetry has period (ie repeats every) 360° or 2π radians ver...
