Edexcel A Level Maths All Answers Correct

Edexcel A Level Maths All Answers Correct 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 Vectors and angles ️If the vector a = xi + yj + zk makes an angle θₓ with the positive x-axis, then cos(θₓ) = x/(|a|) and similarly for the angles θᵧ and θz. Radian to degree conversion ️1 radian = 180°= π Arc length ️l=rθ Area of a circle sector ️a=1/2 x r²θ Arcsin(x) Graph ️ Arccos(x) Graph ️ Arctan(x) Graph ️ Differentiating y = eᵏˣ ️dy/dx = keᵏˣ Differentiating y = ln(x) ️dy/dx = 1/x Differentiating y = aᵏˣ ️dy/dx = (aᵏˣ)kln(a) The Chain Rule ️dy/dx = dy/du x du/dx The Product Rule ️ The Quotient Rule ️ Differentiating parametric equations ️