Edexcel A Level Maths
1 + tan2θ - = sec2θ
cot2θ + 1 = cosec2θ - = cosec2θ
Sin2θ - 2sinθcosθ
Cos2θ - cos²θ-sin²θ
2cos²θ-1
1-2sin²θ
Tan2θ - 2tanθ / (1 - tan²θ)
How do you write a rational number in a proof? - a/b
What does y=|f(x)| do? - Reflects values below the x-axis in the x-axis
What does y=f(|x|) do? - Reflects values of x≥0 in the y-axis
Arithmetic sequence formula - a₁+(n-1)d
Geometric sequence formula - uₙ = arⁿ⁻¹
Convergent geometric series - Convergent if |r|<1 where r is the common ratio
Periodic sequences - Sequence is periodic if terms repeat in a cycle
1 + tan2θ - = sec2θ
cot2θ + 1 = cosec2θ - = cosec2θ
Sin2θ - 2sinθcosθ
Cos2θ - cos²θ-sin²θ
2cos²θ-1
1-2sin²θ
Tan2θ - 2tanθ / (1 - tan²θ)
How do you write a rational number in a proof? - a/b
What does y=|f(x)| do? - Reflects values below the x-axis in the x-axis
What does y=f(|x|) do? - Reflects values of x≥0 in the y-axis
Arithmetic sequence formula - a₁+(n-1)d
Geometric sequence formula - uₙ = arⁿ⁻¹
Convergent geometric series - Convergent if |r|<1 where r is the common ratio
Periodic sequences - Sequence is periodic if terms repeat in a cycle
